I couldn't find any other name
You're so dumb you can't think of a name that isn't your own.
I tried to name my car, but I couldn't find any other name. So now it's 'Stupid.'
I tried to name my song, but I couldn't find any other name. So it's 'Dumb Song.'
I tried to name my breakfast, but I couldn't find any other name. So it's 'Sausage.'