I would love some opinions. My dad said he wants to be called papaw by my daughter even when I was…

I would love some opinions.

My dad said he wants to be called papaw by my daughter even when I was pregnant he said he wanted to be called that. She can't pronounce it very well and he told me he didn't care what she called him since she can't say it very well. What does everyone think about Papa? Anyone ever heard of "papa" for a grandpa?