Ok I am just playing around with ideas for you here, feel free to laugh if they are stupid....
Put Up Your Dukes
____________'s Sir Duke (insert your last name)
His Royal Highness Duke of Our Hearts
Bo Duke (bo= play on boxer/ dukes of hazzard)
Duke of Hazzard
Non-Duke Names:
Brindle Me This, Brindle Me That (if you don't get this, it is dumber than I thought it was

)
Stars 'N Stripes (from the snip of white on his nose and his brindle color)
Royal Pain (

) I have often wished I named Hurricane this, although Hurricane fits too!
Hopefully these can help get the creative juices flowing!