Mainly U.S.: recent coinage, combining the short form Jo with the productive suffix -lene, extracted from names such as Marlene. It seems to have originated in the United States in the 1940s. It was made famous by a hit song with this title, recorded by Dolly Parton in 1979.
English and Irish (of Norman origin): habitational name from Lassy in Calvados, named from a Gaulish personal name Lascius (of uncertain meaning) + the locative suffix -acum. The surname is widespread in Britain and Ireland, but most common in Nottinghamshire. In Ireland the family is associated particularly with County Limerick.