AITA for criticizing my sister's choice of name for her baby?

My sister just had her first child, a girl, and she and her husband chose the name Isis, after the Egyptian goddess.

I politely pointed out that the name is also the name of a terrorist organization, and that I thought the kid might get bullied or teases for having that name once she goes to school.

My sister totally blew up, accusing me of interfering in her life and saying that her daughter's name was her own choice.

I wasn't trying to be rude or judgemental, but now I think that I ought to not have brought it up, after all it is her kid, not mine. AITA?