Shawnnessy is an uncommon, unisex given name of Irish origin, derived from Sean and Nessa, meaning "God is gracious" and "Mortal, lively, enthusiastic," respectively. It's composed of two elements: Shawn, which is a variant of the Irish name Seán, and Nessa, a short form of various Irish names containing the element Ness or Nessa. While not widely used, this unique moniker adds an exotic touch to its bearers' identities.
Shawnnessy saw a spike in popularity with 6 births in 2004, followed by a dip to 5 births two years later in 2006. Over these two years, the name was given to a total of 11 babies.