Most likely mexican. And usually very attractive. Most Isaias's are very sensitive, a lot more sensitive then most guys are. They usually are very loving and will not take things too fast in a relationship. They'll have their heart broken, but yet will still move on and give their heart to other girls. Isaias is usually used to describe a guy who is loving, and will think about others feelings. (which most guys do not do)
"Joe's been acting like an Isaias. And I like being with him."