Our son calls him Papa. We started off calling him Dada when he first started talking, but after a bit Jude started calling us both Mama, and it was sort of bugging my husband so I tried out Papa with our son and he took right to it, and that's what he's called him ever since. I love it because HE chose it and it's not that common.
Daddy. And my daughter ( not his bio daughter ) calls him Pop.
THey call my husband who raised them dad they calltheir bio dad David and only occsionly dad
Daddy and my little man calls him dada.