Dellena is of Italian origin, derived from the surname 'Diella', which is believed to have been an occupational name for a dealer in animal skins or hides. It was traditionally spelled with two L's but has also appeared as Dellena and Dillina. The name first emerged during the Middle Ages, making it one of the older recorded Italian surnames.
"The name Dellena experienced a gap in popularity between 1960 and 1966 with no recorded births during those years, followed by steady usage thereafter."