The meaning of Aaron in the Bible
(From Easton's Bible Dictionary)

the eldest son of Amram and Jochebed, a daughter of Levi (Exodus 6:20). Some explain the name as meaning mountaineer, others mountain of strength, illuminator. He was born in Egypt three years before his brother Moses, and a number of years after his sister Miriam (2:1,4; 7:7). He married Elisheba, the daughter of Amminadab of the house of Judah (6:23; I Chronicles 2:10), by whom he had four sons, Nadab and Abihu, Eleazar and Ithamar. When the time for the deliverance of Isarael out of Egypt drew nigh, he was sent by God (Exodus 4:14,27-30) to meet his long-absent brother, that he might co-operate with him in all that they were required to do in bringing about the Exodus. He was to be the "mouth" or "prophet" of Moses, i.e., was to speak for him, because he was a man of a ready utterance (7:1,2,9,10,19). He was faithful to his trust, and stood by Moses in all his interviews with Pharaoh.

See more on the meaning of Aaron in the Bible:
Aaron {International Standard Bible Encyclopedia}
Aaron {Hitchcock's Bible Name}

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