Birutė

At the time of writing this comment, the description for this name states that its meaning is unknown and that it is probably of Baltic origin. Well, I was able to find more information about the name and I can tell you the following:

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1. The name Birutė is a diminutive, as it contains the well-documented Lithuanian feminine diminutive suffix -utė. When it comes to this, you might want to compare this with the Lithuanian name Laimutė in the main database, which is already correctly listed as a diminutive.

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2. Lithuanian sources all state that Birutė comes from Birė (and also its variant Bira), which is a short form of feminine Lithuanian given names that start with Bir-, such as Birmantė and Birvydė. Also compare given names that start with Ber- (because that element looks quite similar to Bir- and may even be related), such as Bertautė and Bervainė. With that said, it should be noted that while that is true, Birutė can also be the diminutive of Bir- names without involving their short form Birė. In other words: Birutė can easily be a diminutive of both Birė and full Bir- names like Birmantė and Birvydė.

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3. The first element in Bir-names like Birmantė and Birvydė is either derived from the old Lithuanian zero grade verb 'birti' meaning "to be born" as well as "to pour out" and "to spread, to scatter, to strew" (Google Translator only says it means "to exchange") or from the Lithuanian verb 'byrėti' meaning "to crumble, to disintegrate, to fall down". The latter is perhaps in reference to disappearing snow ('byrančiu sniegu', which literally means "crumbling snow") in weather that is too warm for snow to remain in.

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Alright, I believe that was all! Now the only thing left for me to do is to give you a list of the sources that I used:

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- https://de.wikipedia.org/wiki/Birut%C4%97 (in German; mentions that the name is derived from 'byrėti')
- https://www.tevu-darzelis.lt/vaiku-vardai/Birute/ (in Lithuanian; mentions that the name comes from Birė, which is a short form of names beginning with Bir-)
- http://www.vardai.org/vardo-reiksme/Birute/ (in Lithuanian; mentions that the name comes from Birė and that Birutis is the masculine equivalent of Birutė)
- http://day.lt/vardai/Birute (in Lithuanian; mentions that the name consists of Lithuanian 'birti' and the diminutive suffix -utė)
- http://www.thelithuanians.com/names/name2b.html (in English; mentions that the name comes from Birė)
- https://en.wikipedia.org/wiki/List_of_diminutives_by_language#Lithuanian (in English; lists some of the most common Lithuanian diminutive suffixes)
- http://www.su.lt/index.php?option=com_content&view=article&id=3885:hf-fl-sn-2007-12&catid=459&Itemid=1264&lang=en (in English; scroll down to "The tendencies of addressing children in the family" written by Giedrė Čepaitienė)

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BIRTI
- https://translate.google.com/#lt/en/birti (in English)
- https://www.tevu-darzelis.lt/vaiku-vardai/birmante/ (in Lithuanian; this is the entry for Birmantė, which states that old Lithuanian 'birti' is akin to modern Lithuanian 'gimti' meaning "to be born")
- http://etimologija.baltnexus.lt/?w=birti (in Lithuanian; this is from the Lithuanian etymological dictionary, which says that 'birti' means "streuen" in German, which in turn means "to spread, to scatter, to strew" in English)
- page 155 of "Internal Reconstruction in Indo-European: Methods, Results and Problems" written by Jens Elmegård Rasmussen and Thomas Olander: https://books.google.nl/books?id=XlJrPvrGfO0C&pg=PA155 (in English; mentions that 'birti' means "to pour out")
- page 291 of "Lithuanian Grammar" edited by Vytautas Ambrazas: http://lukashevichus.info/knigi/ambrazas_lithuanian_grammar.pdf (in English; mentions that 'birti' means "to trickle")
- page 91 of "Types of Variation: Diachronic, dialectal and typological interfaces" edited by Terttu Nevalainen, Juhani Klemola and Mikko Laitinen: https://books.google.nl/books?id=-RM6AAAAQBAJ&pg=PA91 (in English; mentions that 'birti' is a zero grade verb)

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BYRĖTI
- https://translate.google.com/#lt/en/byr%C4%97ti (in English)
- http://etimologija.baltnexus.lt/?w=byreti (in Lithuanian; this is from the Lithuanian etymological dictionary, which seems to indicate that 'byrėti' is somehow related to the Lithuanian verbs 'birti' and 'berti', since those verbs are mentioned in the entry for 'byrėti')
- "Lithuanian Grammar" edited by Vytautas Ambrazas: http://lukashevichus.info/knigi/ambrazas_lithuanian_grammar.pdf (in English; mentions on page 296 that 'byrėti' means "to trickle" and then on page 444 that it means "to pour") [noted -ed]

According to Wikipedia, Birutė is derived from the Lithuanian word byrančiu, meaning "snow". I don't know how accurate this information is, but I thought I'd share it here anyway. Even if this is only a folk etymology, in use the name has perhaps become associated with the meaning of "snow".