Shannan is a unique and modern female given name of Irish origin. It is derived from the Irish surname "Ó Seanáin," which means "descendant of John." Over time, this surname has evolved into various forms, including Shannan. The name has gained popularity as a given name in recent decades, likely due to its attractive sound and Irish heritage.
"Over three decades, the name Shannan experienced fluctuating popularity, peaking at 24 births in both 1974 and 1978. However, by 1999 it had declined to just five births."