[andai]

What’s this? A name that changes when you are talking to someone directly? In some Slavic languages this happens.

[thaumasiotes]

Usually the name would change according to the full rules of noun inflection in whatever language. In Latin, a noun has 6 cases, of which vocative (indicating direct address to the noun) is one.

[thefringthing]

Irish has a vocative case that can modify names, and is an official language of a UN member state.