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They don't have one. Like Mario and Luigi don't have one.
I don't know what Wario and Waluigi's last names are, but I know that Mario and Luigi have last names: Mario Mario and Luigi Mario. That's why they're called Super Mario Brothers.
What else can I help you with?
What is waluigi's last name?
waluigi wario is his last name
Are wario and waluigi twins?
Wario and Waluigi are brothers. They're the evil opposites of Mario and Luigi.
Are Mario luigi wario and waluigi all brothers?
No, though they might be cousins, and Wario and Waluigi might be brothers, but it is uncomfimed.
Is Super Mario and Wario related?
No. Mario and Luigi are brothers, and Waluigi and Wario are brothers. Wario and Mario; and Luigi and Waluigi are no related in any way. they are only rivals.
Are wario and luigi friends?
I guess so because Wario is not friends with Luigi. Wario must be best friends with Waluigi like Mario and Luigi are best friends and bros. So Wario and Waluigi must be best friends and bros.
