Which boy name for a potential third son?

We're not expecting, but we are seriously considering having another child in the future and we had such a hard time agreeing on a second boy name with our last that I figured it doesn't hurt to throw some name ideas around now. Our first son is Liam Croughan (Croughan is a family name, not my first choice either but it was important to my husband and I don't hate it) and our second is Aidan Christopher. When we were deciding on the second one there were only about 3 names that my husband and I could agree that we both didn't dislike.

One name my husband really likes a lot is Brennan. At the time I didn't care for it, it seemed too much like a boy's name that is relegated to only being used on girls these days (like Ashley or Aubry) to me. But I have to admit that it has grown on me. An alternative that I believe he suggested was Brendan. I don't dislike it, but it kind of reminds me of a dog I once knew. Again, in the time since we discussed baby names I've softened to the idea of Brendan too (although my husband still prefers Brennan). So here are some names I've been tossing around for a few days now:

Brennan Edward. Edward is my father's name and I think it flows quite nicely with Brennan. I really like using family names as middle names.

Brendan Robert. Robert was my grandfather's name. It was also my husband's maternal grandfather's nickname (his mother was sick when it was time to register him for school and his sisters disliked his name Oscar so they registered him as Robert...it stuck and he graduated high school as "Robert" instead of Oscar)

Brennan/Brendan Gale. Gale was my husband's late father's name. Originally we were going to use Gail for a girl, but we've since found a girl's name we like better. Gale is far too feminine to be suitable as a first name (my FIL was always getting invitations from the women's bar association to speak at their annual meetings!).