Loki family surname!

So everyone knows by now that Loki's having puppies! Well, Daegmar's having puppies, but... anyway! So Loki is trying to veer away from his family's naming traditions, but he still wants his kids to bear a surname so they can show pride in being a family. So since he doesn't want Lokisson or Lokisdottir for his kids he needs to think long and hard and pick one to be passed down the generations. I have a few ideas I'm ruminating on, and would like more options and some opinions from you guys. :D

Silvertongue (self explanatory)
Lokasenna (Loki's Quarrel, a poem from the Poetic Edda)
Yggdrasil (the world tree)
Vanir (a group of gods from norse mythology)
Aesir (the other group of gods from norse mythology)
Ragnarok * (end of the world as foretold by norse myths)
Frost * (well, because Loki's a frost giant)


* current favorites

Feel free to leave suggestions and comments on which you like/don't like. Loki doesn't have to decide until they're actually born, and when he does he'll be taking the name in addition to Hroovitnisson.