The majority of English native speakers call their father Dad, or Daddy, and there’s not a lot of variation wherever people live in the English speaking world.
Papa is beginning to become more fashionable with new Dads, who think it’s softer and more friendly than Dad.
Like Mum and Mama, Dad and Papa are thought to come from dada, papa or tata, or the babbling sounds that babies make when they’re learning to speak.
Grandfather, however, has more variations. You might hear: Granddad, Grandpa, Gramps, Grampy, Papaw, Pops, or Poppy.