DD has my great-grandmothers name as her middle name.

This bub will either have FILs name as his middle name (matches well with first name) or my middle name as middle name if its a girl (again, matches well - we are all about the number if syllables here too so it flows!).

I have friends who picked family names and gosh they just do not flow whatsoever (in fact I think they are terrible) but each to their own, everyone has their own reason for picking names!!