Children's names are restricted in many countries (including my own, New Zealand):

https://en.m.wikipedia.org/wiki/Naming_law

Hopefully someone will add the reason for Lithuania.

Iceland:

  Parents are limited to choosing children's names from the Personal Names Register, which as of 2013 approved 1800 names for each gender. Since 2019 given names are no longer restricted by gender. The Icelandic Naming Committee maintains the list and hears requests for exceptions.

New Zealand: Below is a list of banned names in New Zealand:* [Asterisk], 4Real, 89, Anal, Bishop, Constable, H-Q, II, III, Justice, Justus, Knight, Lucifer, Mafia No Fear, Minister, Mr, Queen Victoria, Royale, Saint, Sex Fruit, Talula Does The Hula From Hawaii. Note I suspect * is special because I think it is a is placeholder in the Dept. Internal Affairs for none (I had an acquaintance that changed their name to a single word and the asterisk appeared in their surname field officially - also see http://wookware.org/name.html )

And hilariously Australia had this girl called Methamphetamine Rules recently: https://www.theguardian.com/australia-news/2023/sep/19/can-y...

There is a legal requirement to adjust names to conform to Lithuanian morphology. This includes foreign names.

Cultural war it seems.

"VLKK Chairperson Violeta Meiliūnaitė claims that legalising such a spelling would “violate the Lithuanian name system and have a negative impact on the country’s linguistic and cultural identity and distinctiveness”."

https://media.efhr.eu/2023/09/27/vlkk-legalisation-of-female...

It is required by law because this is part of the language. So not to break the language. It is in most slavic countries. I think Russia is the biggest one. Female surname - ova/ska, male - ov/ski. Check in google translate "One car and one truck" - the word one is gendered. It is normal way of speech - don't confuse this with north korea where you have a list of few names to choose from.