Hi ksenia, it`s correct! Here in brazil we said "apelido" but you need to get attention because if you talk about "nickname" in internet or games we usully said "nick". For exemple my name is thales but my niece call me "Tatá" it's is a "apelido". But when i play some games my nickname is "thalestav" and we said : my nick is thalestav, ok ? If you have any other doubt text me. See ya later.

Apelido