Calogero Family History

Italian (southern): from the personal name Calogero (from Greek Kalogeros literally ‘handsome-old’). In Sicily especially this name was popularized by the cult of Saint Calogero, a 5th-century Christian martyr from Constantinople who spent part of his life in Sicily.

Possibly also an American shortened and altered form of any of various Greek surnames based on the personal name Kalogeros (see 1 above) or the cognate occupational name kalogeros ‘monk’.

As for example Kalogeropoulos and Kalogerogiannis (combined with the personal name Giannis ‘John’).