To use this name??

[Readytopop12]

I'm due a baby soon
The boys name my DH really wants is his grandad's name. It's a popular, top 20 boys name. Only problem is my cousin (mum's sisters son) has already used his name for his DS.
I never see my cousin or his DS (once in last 5 years) and am only likely to see them in the future at big family events eg. weddings and funerals.
However, my DM is fairly close to her sister and I think my DM thinks it's not right to use the name.
My DHs name would be the middle name as per family tradition so using the name as a middle name is not an option (I'm not into more than one middle name). We had others on the short list but nothing we love as much as this and it would mean the world to my DH to use his grandad's name (he died of cancer a few years ago).
I figure as we never see my cousin and it's a popular name anyway we aren't BU but I know my mum is uncomfortable with it...
Opinions??

I would use it, but send a note to your cousin explaining it is DH's grandad's name & it means a lot to him and you hope they don't mind. I think considering it's his grandad' name nobody could really object.

Not unreasonable at all, but I'd give them a heads up just to be polite. When a relative on fathers side of the family copied our child's name (was copied, spelling changed-it was very unusual at the time and they admitted copying) I was a bit upset when I saw it announced on Facebook, but had it been mentioned beforehand I wouldn't have minded at all. I wouldn't ask for permission-just mention it is a name you are considering for family reasons.