names for twins?

[milkgoddessmakesthefinestmilk]

? yes this friend is trying to cover all eventualities

lol

William (Bill) and Benjamin (Ben)

I knew twin boys called Tom and Gerry

Im not even pregnant yet but there are twins on both sides so have been thinking what if??
I think the 2 names have to flow but not neccessarily start with the same letters as people usually do.