The word Hebrew is a Hebrew word, borrowed into English from the greek language, (in the same way that most Hebrew names from the Jewish Bible were borrowed into English via Greek, such as Moses and...
If you are talking about the Hebrew language, it's eevreet (עִבְרִית). If you are referring to the people of Ancient Israel, a male Hebrew is eevree (עִבְרִי) and a female is eevreet...