Two people named Havilah appear early in the Bible.
1. Ham > Cush > Havilah
Genesis 10:7; 1 Chronicles 1:9
2. Shem > Arphaxad > Shelah > Eber > Joktan > Havilah
Genesis 10:29; 1 Chronicles 1:23
The "land of Havilah" mentioned in Genesis 2:11 as being part of the Garden of Eden also appears later in Genesis 25:18 and probably refers to the Arabian peninsula and possibly a portion of Africa.
Genesis 2:10-14:
10. A river watering the garden flowed from Eden; from there it was separated into four headwaters.
11. The name of the first is the Pishon; it winds through the entire land of Havilah, where there is gold.
12. (The gold of that land is good; aromatic resin and onyx are also there.)
13. The name of the second river is the Gihon; it winds through the entire land of Cush.
14. The name of the third river is the Tigris; it runs along the east side of Asshur. And the fourth river is the Euphrates.
Genesis 25:17-18
17. Altogether, Ishmael lived a hundred and thirty-seven years. He breathed his last and died, and he was gathered to his people.
18. His descendants settled in the area from Havilah to Shur, near the border of Egypt, as you go toward Asshur. And they lived in hostility toward all their brothers.