sorry if I'm wrong here, can't find any tread on it. I don't know if my translator is correctly displaying this: as a gm you can change your pet name once a month, as a non gm every week?

Non gold will be able to change 1 pet name per week, and gold accounts will be able to change all of their pet names once per month.
For example you have 23 pets and a gold account. You will be able to rename all 23 pets, one time each. Next month you will be able to change the names of all 23 pets again, if you desire.
I do not have gold, so I will only be able to change 1 pet name this week. Next week I can change 1 name again.
I hope this helps!
answered your question very well. But if you have more questions about non-unique pet names, the thread you are looking for is here:
FAQ about Legacy Names/Non-Unique Pet Names
:)
ty both for answer, i will read the FAQ, cause i don't know how to change all names in one time, i can do that only part by part, or i no see the option for all pets in one time... :)...

You still have to change them one at a time, but you can change all of them. Without a GA, you can change one pet name once per week. With the GA, you can change all of your pet names (one at a time) once a month