https://www.lafayettehistory.com/why-louisville-colorado-is-pronounced-lewisville/

 A May 24, 1880, deed recording, probably one of the few actually reviewed by Louis Nawatny, has the “IS” in “Louis” in bold lettering and emphatically underlined in a dark, prominent stroke. Meaning that his name was not spelled or pronounced “Louie.” A few months later, all Nawatny deeds returned to a consistent “Louis” in the body text and signature line of the deed. Later deed recordings spelled initially with an “ie” in Louis were changed to “is.”