We didn't name any of our kids after family members for this reason, I didn't want to deal with potential hurt feelings & grandparents feeling left out...

We did end up giving DS2 and DD2 middle names that related back to us. But no grandparents!

It's such a tricky thing, some parents expect it... I think maybe it was the done thing years ago, these days it is really up to you.
Your MIL has already got a look in, and as you say your own mother hasn't.. I would just turn a deaf ear to any complaints

I like your list...Brynn Eaden is my pick