I don't think there's any limit to characters in names these days, due to foreign people with very long names, so you could go with your preferred choice.

You might need a shortened version though as I don't think there's that many character boxes on the tax form 🙂

Hmmm, so I guess "Wickedly Awesome Canine That The Whole World Luurves To Bits" could be a problem as well....

Signed,    Batgirl..........

Probably not if you only have one U in Luurves 😛