Problems with soon to be marriage?

Uh.. yeah. So my gf and i are thinking about marriage. But we have one disagreement. She wants to keep her last name. Because her father died and she thinks it would be respectful or something, and to keep her last name living on. But.. Since im the man, i want it to be my last name, just because of tradition.. And hell, my last name sounds a lot better then hers :/ What do i do?