A Lithuanian surname is not a single fixed label the way an English one is. The same family can appear as Antanaitis in one record and Antanavičius in another, a mother can carry a different ending from her sons, and a clerk’s language can rewrite the whole thing. That does not make Lithuanian surnames unreliable. It means each form carries information, if you know what to ask. This guide organizes Lithuanian surnames around three questions: where a name comes from, how old the system is, and which form you are actually looking at. It points to dedicated guides for women’s forms, given names, spelling variants and surnames abroad.
Question one: where does the name come from?
Based on their origin, Lithuanian family names fall into several groups, according to a general reference article on Lithuanian names. Formally, surnames are divided into Lithuanian ones and non-Lithuanian ones, and the latter are mostly of Slavic origin but now carry partly Lithuanized endings. The table gathers the groups the sources describe and gives one example from each source where we found one.
| Type | What to look for | Example from the sources |
|---|---|---|
| Patronymic, from an ancestor’s given name | Endings such as -aitis, -onis, -ūnas, -ėnas and -ynas, all meaning roughly son or descendant of | Antanaitis, from the given name Antanas, and Grigonis, from Grigas with the suffix -onis |
| Patronymic with a Slavic-style ending | -avičius and -evičius, which are patronymic too but considered more Slavic than -aitis | Antanavičius, which one researcher’s family used alongside Antanaitis |
| Slavic-origin names with Lithuanized endings | -auskas, -iauskas, -inskas, -ickas, -eckis, -avičius, -evičius and -iškis | A general reference article gives the endings but not individual names |
| Nicknames and characteristics | A common word turned into a name | Rėksnys, which comes from a word meaning a shouter or bawler |
| Noble family names | A noble house’s name turned into a personal surname, sometimes with a suffix added, dropped or changed | Surnames that arose this way at the end of the seventeenth century, many of which survive today |
Notice what is missing: a reliable map linking particular endings to particular regions. One popular surname site claims that surnames in Samogitia differ from those in Aukštaitija, but we found no scholarly source behind that, so we do not repeat it. Treat any claim of the form “names ending in X come from region Y” as unproven until you see a study.
Question two: how old is the surname system?
Surnames spread through Lithuanian society from the top down, and the sources show different layers at different dates.
| Period | What the sources say |
|---|---|
| Before the fifteenth century | Lithuanians used one basic name only. From the fifteenth century, documents show a second name alongside the first, and the custom became common in the sixteenth century. |
| Fifteenth century onward | The gentry used heritable names earliest. A study of Kaunas suggests surnames must have been in use among the gentry as early as the fifteenth century. |
| Sixteenth century | Urban elites, especially German-speaking Lutherans in Kaunas, had family names in the first half of the century. In the middle of the century, noble house names were still used as names of individual nobles rather than as surnames. |
| Seventeenth century | Surnames among the urban middle and lower classes were completed. At the end of the century, noble family names became surnames. |
| Late sixteenth to eighteenth century | Peasant surnames began to appear sporadically at the very end of the sixteenth century, and the process was not yet fully completed among peasants in the eighteenth century. |
| End of the eighteenth century | One journal summary says the formation of last names was practically finished by then. |
These sources describe the process in slightly different terms, so the safest conclusion is that surnames formed over about three centuries and that peasants came last. For a researcher, that means an ancestor’s surname in an early record may be a nickname, a patronymic or a village label that had not yet become hereditary. If the name changes between a father and a son in the eighteenth century, check the records before assuming a different family.
Question three: which form am I looking at?
The form of a Lithuanian surname depends on the person’s sex and, traditionally, on a woman’s marital status, and also on the language of the record. A man might be Petrauskas, his wife Petrauskienė and his daughter Petrauskaitė, and all three belong to one family. Our guide to men’s and women’s surname forms explains how to convert each form back to the family name. The same name may then be written differently by a Latin, Polish or Russian clerk, which we cover in the guide to spelling variants. Given names get the same treatment, and they are in their own guide.
Why one family can carry two surnames
When Lithuanian family names were forming, the official language of the government was a Slavic chancery language, a variety of what the journal calls Belorussian or White Russian, and later Polish. Lithuanian names were frequently written with Slavic patronymic endings, which is why many Lithuanian family names end in -avičius or -evičius, according to a journal article on Lithuanian names. A family that used the Lithuanian ending among themselves could therefore be recorded under the Slavic one, and a researcher’s own relatives show it: one family used Antanaitis while others used Antanavičius, and a brother and sister disagreed on whether the name was Antanaitis or Antonaitis.
There was also social pressure. With the Polonization of the Lithuanian nobility came a conscious effort to Polonize Lithuanian names, and the same article says some Lithuanians tried to hide a lower origin by adding a noble-sounding -ski to their own surname. A surname that ends in -ski is therefore a clue to the record’s language and perhaps to ambitions, but not proof of noble descent. We cover noble families in our complete genealogy guide.
Inherited in the male line
Lithuanian surnames are hereditary and generally patrilineal, passed from the father to his children, according to a general reference article, and a married woman usually adopts her husband’s name. The practical rule is that the male line carries the family name from generation to generation, while a woman’s form changes with her status. When you build a tree, record each woman under her own name as the record gives it, and keep the family stem as a separate field so that you can search for her father’s family.
When the surname is really a nickname
In the period when family names were forming, a person without an official family name was frequently known by a nickname, and nicknames were very popular, according to a journal article on Lithuanian names. That explains the origin of many names, such as Rėksnys, and it also explains why an early record may give a name that later disappears. The article says the name gradually became fixed and no longer changed from generation to generation. For a researcher, the sign of a name that has settled is simple: the same form appears for a father and his sons, in more than one record, over more than one decade. Until you see that, treat the name as a label.
Other communities followed their own timetable. A study of Lithuanian Tatars, for example, reports that their patronymics can be considered formed surnames from the middle of the sixteenth century to the beginning of the seventeenth, and that the first Lithuanian Tatar surname it found was recorded in 1631. This site does not cover Tatar family research, but the example shows why a single date for the start of surnames in Lithuania would be misleading.
A worked example, invented for illustration
Example (invented, for illustration only): A reader finds his great-grandfather as Jonavičius in a U.S. record and a cousin finds the family as Jonaitis in a Lithuanian parish record. Both names share the stem Jon-, which fits the given name Jonas, the Lithuanian equivalent of John. The two endings are patronymic suffixes of the kind described above, one more Slavic and one more Lithuanian. The reader writes both on one family sheet and compares the parents’ given names and the village before deciding that the records belong together.
What we could not confirm
- A reliable list of how common each surname is today. Several sites publish counts, but we found no official source we could cite.
- The origin of any individual surname. The etymology of a specific name needs a specialist dictionary, and the sources we used give only a few examples.
- The geography of endings, as noted above.
Starting your own surname file
- List every spelling of the surname you have met, with the record, the year and the language.
- Mark the likely stem, which is the part before the ending, and note the given name it might come from.
- Convert women’s forms to the family name using the rules in our forms guide.
- Check whether the name changes between generations, and look for the village before deciding that two families differ.
- Keep the Lithuanian form as your working name and record the others as variants, then search the church books and indexes under every form. More guides are in Names & Surnames.
Sources for this guide include a reference article on Lithuanian names, an article on Lithuanian names in the journal Lituanus, a case study of the surnames of a Lithuanian village, a study of surname formation in Kaunas, an article on noble family names as a source of surnames, a study of the surnames of Lithuanian Tatars and a Lithuanian Catholic ancestor-search guide to surname forms. The last is a private researcher’s site, so we use it for examples and not as an authority.
A two-day plan for starting your own research is in our first-weekend guide.
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