Baby Twin Girls Robinson

Heather writes:

I'm expecting twin girls at the end of December and we are having trouble deciding on names! Our two older girls are named Dagny and Harper, both names that we agreed to early on, and our last name is Robinson which works well with a lot of things. For the twins right now we like Auden a lot, but we are really having a hard time with the other name. We don't have to be too tied to the literary connection between the names, and also want something a unique (Harper became more trendy since we named our daughter in '09). Some names we have considered so far: Poppy, Tate, Penelope (Penny), Paige, Tabitha, Finna, Sawyer. Poppy is probably our first choice, but I'm concerned about it being too trendy, not serious enough as she gets older, and it's very different than the others. We like Tate too but are worried about it being too masculine, and I don't really like Tatum. Help!

Thanks for your advice!