Elon

An Edomite, in the time of the Patriarchs · Edom · named in 2 verses

the name means oak-grove Strong's Lexicon

Elon the Hittite was the father of Basemath, one of Esau's wives.

From Easton's Bible Dictionary

Oak. (1.) A city of Dan (Josh. 19:43).

Easton's Illustrated Bible Dictionary, 1897 — public domain, quoted in full and unedited.

Children Adah

From STEPBible's TIPNR genealogy data. A relationship the data marks uncertain is not shown here.

First named at Genesis 26:34.

Genesis 26:34 When Esau was forty years old, he took as his wives Judith daughter of Beeri the Hittite and Basemath daughter of Elon the Hittite.
Genesis 36:2 Esau took his wives from the daughters of Canaan: Adah daughter of Elon the Hittite, Oholibamah daughter of Anah and granddaughter of Zibeon the Hivite,