When we found out we were having twins DH and I didn't want to know their genders, so tried to come up with b/b, g/g, and b/g sets of names. The same gender name were easy for us.
b/b Silas (we were set on this as a boys name) & Avery
g/g Iris & Sylvia
but we could not agree on a girl name to go with Silas. The tech slipped up at my 20 week u/s and let us know we were having b/g twins, so we started making lists. It wasn't until a few weeks before they were born that we finally agreed on Silas & Mira (meer uh when people read it they tend to pronounce it Myra). Now almost everytime someone asks their names they've heard of another toddler named Silas, but no other Mira's. It's funny, because I don't think of her name as uncommon, but she does get compliments on it regularly. And though it's not her name, we frequently call her Mirabella.
Olive (my mom's middle name...good thing we didn't use it, DD is skinny, dark and tall!)
Jane (couldn't get over the plain Jane saying, even though I think it's pretty)