Top Definition
Dionymal names are those that have two uses, most commonly occurring when first names can be last names and vice-versa.

Kelly: "Hey, my name's Kelly George. What's yours?"

Tim: "Eh, Im Tim. Wow, you've got a dionymal name!"

Kelly: "Uh, what does that mean Tim?"

Tim: "Well, it means your first name can be a last name, and your last name can be a first name. Dionymal"

Kelly: "Wow Tim, you're a loser"

Tim: "Whatever slut, get a dictionary"
by TooMuchTV November 16, 2009
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