No one in InuYasha actually has a last name, or they do but they never mention it in the books or the series, the only person who does have a last name is Kagome. So in short, he doesn't have one.
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bardok does not have a last name just like goku does not have a last name
Squidward's last name is Tentacles. Squidward's last name is Tentacles.
his last name is butler
a maiden name is a last name that you had before you where married
her name is Selena and her last name is Gomez