Name suggestions

Hello, so my MIL wants her partner to have a name like grandad (for context this is the third boyfriend since I got pregnant, baby is 4 weeks old) I don't want to use grandad (this is what we call my dad) or pops (my nieces name for my dad). My partner doesn't have a bio dad in the picture so no name taken there. Anyone got any cute names? Also his name is Anton so any play on that I'd be open to...