Following the discussion about people's names in Halacha,
Is there any obligation and a way of registering names in the Halacha?
Is there an authority responsible for registering names - a Bais Din or a Rabbi of the community, whose job is to register the babies names and the changes and share them between the communities?
For example, I was born Eli - who's witnessing that I'm Eli? And what if tomorrow I move to Tel Aviv and call myself Hayim? Then two people know me by different names and they can't testify in capital crimes or Kiddushin and Gittin.
I know that the IDs is a very recent invention, but how the Halachah addresses that?