Changing names?

I would let her change it. Like everyone else said she is old enough.I have an almost 3 year old and 4 year old. I would love to change their names. The 3 year old I want to use her middle name as a first name (it is a family name of mine and much much prettier then her first name). The 4 year old has an ethnic sounding name. It doesn't fit her, but she does tell everyone she is 4 now, and 4 year olds have a new name..so who knows.