* "Kothanar" as a title or honorific: This is most likely used for a "chieftain," "leader," or "headman" in a village or community.
* "Kothanar" as a profession: It can also refer to a "goldsmith" or "metalworker."
* "Kothanar" as a surname: This is a common surname in Tamil Nadu. In this case, the best translation would simply be "Kothanar" as the surname.
To give you the most accurate translation, please provide more context about how "kothanar" is being used.