Confining to names mentioned by the thread author-
No mention so far of that north Texas metropolis, Lavon, pop. 400 or thereabouts. Named after Lavon Thompson, whose father ran the P. O. in 1888.

Lavon occurs as a surname in the U. S. Census (both blacks and whites listed in google). Also appears as a Jewish name, one was an Israeli cabinet member involved in some scandal.

Lavonne and LaVon appear as girls names; supposedly derived from Yvonne.
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Rabon occurs a surname; one is Don Rabon, authority on statement analysis and author of a book on the subject. There are several families in the South Carolina area.
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Alton is not uncommon.
In addition to the English Alton, there are Alton, Ontario, Alton, Nova Scotia, Alton New Hampshire, Alton Kansas and Alton, Illinois (named after Alton Easton about 1818).
There is a Ken Alton from B. C. here in Calgary, learning Computer Science at the university. Dr. Alton Harestad is a professor at Simon Fraser.
John Alton (b. 1901), cinematographer, is well-known for his book, "Painting with Light."
Alton Miller is a well-known Black musician with several albums available
In Quebec, D'Alton Corey was a railroad executive. D'Alton McCarthy from Dublin came to Canada in 1847 and became an important politician.

Many more can be googled.