Sheana is of Irish origin, derived from the ancient Irish female given name Siobhán. It means "God is gracious" or "God is merciful." The name gained popularity in the United States during the mid-20th century and continues to be favored by parents today. Phonetically, Sheana is pronounced shay-AH-nə, with the stress on the second syllable. Variant spellings include Siobhan, Sheavan, and Seanah.
The name Sheana experienced significant popularity from the late 1970s to the mid-1980s, with peaks of 51 births in 1983 and 71 births in 1985. However, its usage has steadily declined since then, dropping to a low of 6 births per year between 2000 and 2004, with some years showing no births at all. Overall, there were 623 babies named Sheana from 1968 to 2009.