Is Costello an Irish name?

Question:

Is Costello an Irish name?

Best Answer - Chosen by Asker: Originally Italian, but came to Ireland and other places a long time ago. So it is an Irish surname in that it has been there a long time. Just as David is an English first name even though it existed in other languages before English.

It doesn't mean it need have Italian roots though. Just as African Americans often have Welsh and Irish surnames, so too serfs could take on surnames of vassals in Medieval Ireland.