What do you think of the Name Josiah Joseph Spencer Sparks-Webb? should I leave it just Sparks?

Sparks is my boyfriends last name, but my daughter has a hyphenated last name and i dont think I'll feel right if this baby dosn't have the same last name as us? Also what about Josiah, at first i thought it was so unique now I keep hearing it all the time. Do you think it's a common name?