The name is derived from the name Lacko (hypocoristic form of the Slovak given name Ladislav ‘Ladislaus’). It may also be derived from the medieval Hungarian given name Laczkó (hypocoristic form of the Hungarian equivalent of the same first name; old spelling). In both cases, it, refers to the connection with the father or another ancestor by that name. Variants: Lackó, Laczko, Laczkó.