Deavan is an uncommon, unique feminine given name of unknown origin. Its usage remains quite limited, with very few individuals named Deavan worldwide. The name has been most commonly used in the United States since its first appearance in the 1990s.
"Deavan was quite popular among parents for a brief period in the late '90s, with a notable spike in usage in 1996, but it seems to have fallen out of favor by 2009."