Thanks everyone for the responses. I haven't settled on anything. I'll really have to run some of these by SO (but I'm not holding my breath..) lol. I'll keep my M.E.L idea in mind but I do have a back up plan (mn Robert after my dad).
I'm really liking Morgan the more I think about it....I wonder if I can get him on board......hmmm
With those girls names, I think Micah is still fairly clearly a boy. I also like Mason in your set. I particularly like Mason Robert - I like the balance of modern and historical.
Maybe already suggested but:
ALSO if you don't mind me asking what was Grandpa Melvin's middle name? Is it or a variant on the table?
For another middle (or first?) What about VINcent to touch on MelVIN?
Or some MEL names
Carmel (I think has more feminine use than male, but in the middle?)
Tahmel (place name)
Romel or Romelo could honor Robert and Melvin. Or Vincent Romel, Vincent Romelo.
Of course I recognize this doesn't really seem to your taste at all - but I do think they are handsome names : D.
Montgomery suggestion. Monty is such an adorable nickname!
I like Morgan for a boy too, but living in Wales, it's a unisex name now, but still leans to the boys. As I understand it, it's more for the girls now in the USA?
OP I understand your struggle with M names...they are hard!
Oh I'm glad you like Vincent! I think it's very handsome. It's very different from your girls' names but in a way that still totally works. I mean I think it still sounds faintly surnamey like theirs Much less Irish and less modern, but still that tie in.
Oh another vin option: Calvin?