I love
Rufus. "Doofus" never came to mind, but it doesn't phase me. Even without a "go-to" insult, any kid with any name can be teased and, for me, "doofus" or "goofus" just aren't a big deal, easily brushed off.
"
Rufus Rufus bo bufus, banana fanna fo fufus, mi my mo mufus.
Rufus." No sweat. :)