In the 1977 film Wizards, Avatar says:
Oh yeah... one more thing: I'm glad you changed your last name, you son of a bitch!
But neither Blackwolf, nor Avatar ever had a last name. What was he on about?
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I think it was to imply that Avatar wanted to disassociate himself from Blackwolf as much as possible, probably out of shame of being related to him, especially after the horrible actions he'd taken against his own people.