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

light; the sun, (Genesis 41:45,50), the great seat of sun-worship, called also Bethshemesh (Jeremiah 43:13) and Aven (Ezekiel 30:17), stood on the east bank of the Nile, a few miles north of Memphis, and near Cairo, in the north-east. The Vulgate and the LXX. Versions have "Heliopolis" ("city of the sun") instead of On in Genesis and of Aven in Ezekiel. The "city of destruction" Isaiah speaks of (19:18, marg. "of Heres;" Heb. 'Ir-ha-heres, which some MSS. read Ir-ha-heres, i.e., "city of the sun") may be the name given to On, the prophecy being that the time will come when that city which was known as the "city of the sun-god" shall become the "city of destruction" of the sun-god, i.e., when idolatry shall cease, and the worship of the true God be established.

See more on the meaning of On in the Bible:
On {Hitchcock's Bible Name}

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