Each is the approximately the same as saying Phoenix. As I have a phoenix summon, but do not want to call it phoenix.
Each is a combination of the words 'Fiery' and 'Bird' from a different language.
Rozotak is Polish
Fyr is Norwegian
Atekiz is Turkish
Granted, Fyr is essentially just Fiery and not including Bird, but if you don't know Norwegian or haven't read this, then you wouldn't know. Mostly cause Bird in Norwegian is just...Bird. (That's what google tells me ._.)