How do you pluralize Williamson?

No because on is an adjective, not a noun.

She stopped writing between May 21 and June 5, 1864, because she was studying.

Alice Williamson began her diary in the winter (February, 1864).

Debbie Williamson is the author of STAND. It is a very poignant memior of her child rape and her families abuse that went on for many generations. It tells of her journey to healing from abuse to...

Williamson-Dickie is an American company headquartered in Fort Worth, Texas established in 1918 by C.N. Williamson and E.E. "Colonel" Dickie of Bryan as the U.S. Overall Company.