Elaboration of Mary, with the addition of the productive suffix -lyn (see Lynn). It is recorded in the 18th century, possibly as a blend of Mary and Ellen, but first came into regular use in the 20th century, peaking in the 1940s and 50s. Since then its use has been surprisingly moderate, considering the enduring popularity of the film star Marilyn Monroe (1926–62), baptized Norma Jeane Baker.
Spanish (Concepción): 1. habitational name from any of numerous places named La Concepción. 2. from the Marian female personal name (from Late Latin conceptio, genitive conceptionis ‘conception’), alluding to the immaculate conception of the Virgin Mary.