(mono meaning one) Isaiah played a very important role, as a prophet, exhorting the unfaithful Israelites, to quit their disgusting practices, idol worship and return to worshipping the one true God Yahweh. (in English. Jah or Jehovah)
They were the first group in the middle east to practice monotheism (or at least monolatry, which is an early form of monotheism).
prophet
Isaiah Frey plays Cornerback for the Chicago Bears.
Isaiah Trufant plays Cornerback for the Cleveland Browns.
Isaiah Green plays Cornerback for the Pittsburg Steelers.
Isaiah Canaan plays for the Houston Rockets.
Isaiah Frey plays for the Chicago Bears.
Isaiah Lewis plays for the Cincinnati Bengals.
Isaiah Crowell plays for the Cleveland Browns.
Isaiah Trufant plays for the Cleveland Browns.
Isaiah Burse plays for the Denver Broncos.
Isaiah Green plays for the Pittsburg Steelers.