Is it rude?

Not prego yet but I want to know if this is something I have ground arguing. Our first son has my dad's middle name. My husband thought we would use his dads name if we ever had another one. However, I think we should use his Step dad's middle name. They get along get along great and he has be more of a Grandpa to our son then his dad has ever been a parent or grandparent. Plus his step dad has no kids of his own. His dad has Three others. Do I have ground on this? I can't stand the idea of using his dad's name after all the crap he's put my husband and his brother through.