This is something I would do.nbsp; BUT if you were going to have a third, I would feel the need to match it with the lyn ending.nbsp; So if you cannot match it, then I would stay away from it.nbsp; I love using the same letters for example Elizabeth and Emily as sisters, but if you had a third you have to continue with the E trend.nbsp; In my books, same goes for the rhyming trend.
I don't mind the matching as long as you love both names and chose them for a reason, and not so they'd rhyme.
My DDs are Mary and Martha [obviously both start with the same 3 letters] after their greatgrandmothers. We call DD1 Addie [nn from her middle name Adeline] and DD2 Martha Rose. The names are important family names.
With all that said, I don't feel that I have to use another Mar name if we should have a 3rd DD. We do plan to keep using family names though.