show name help needed!!!

[italylyns]

I am entering my gorgeous boy into his first showjumping competition on sunday but his registered/passport name is Rosco big show which i dont really like!

Should i use his registered name or can i make one up???

He is 16hh full Irish Draft.

Anyone got any suggestions. Iwill attach a pic so you can see what he looks like

 

[Blitzen]

I quite like the name he has already!
He's absolutely gorgeous, btw!

 

[DanaHart]

Unaffiliated, you can use whatever name you like...... Affliliated, you need to use passported name.....