#0203 אוֹן 'Own {one}

 the same as H0202; TWOT - n/a; n pr m

—Hebrew Word Study (Transliteration-Pronunciation Etymology & Grammar)

 On = "wealth" or "vigour"
 1) a chief of the tribe of Reuben

—Brown-Driver-Briggs (Old Testament Hebrew-English Lexicon)

—Strong's (Hebrew & Chaldee Dictionary of the Old Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - On 1; 1

—Exhaustive Concordance (KJV Translation Frequency & Location)