A king.
"In ancient Scotland, every nobleman was referred to as a roy regardless of his actual rank below the monarch."
Royal.
"The roy attended the state banquet wearing their formal royal attire."
A male given name from Scottish Gaelic.
"Roy is a popular royal baby boy's name in Scotland."
The word "roy" entered English primarily as an Anglicization of the Bengali surname raẏ. It is also a variant spelling related to the Old French term for king, which shares ancient roots with words meaning ruler across many European languages.