| Meaning | From the given name Luca (Luke) — from Greek Loukas, possibly 'man from Lucania' or from Latin lux (light) |
| Origin type | Patronymic — son of Luca |
| Frequency | Top 10 in Italy; extremely common in Campania and across the south |
| Regions | Campania (Naples region), Calabria, Basilicata, Puglia; heavy Italian-American presence in New York, New Jersey, Pennsylvania |
| Variants | De Luca, DeLuca (American), Di Luca, Delucchi, Luca, Lucas (anglicised) |
| Notable bearers | Dino De Luca (artist); Errico De Luca (writer); Gianni De Luca (comics artist) |
De Luca is a patronymic surname — son of Luca — deriving from the given name Luca, the Italian form of Luke. The name traces to the Greek Loukas, which carries two possible interpretations: a man from Lucania (the ancient region of southern Italy between Campania and Calabria) or a derivative of the Latin lux, meaning light, with Luke the Evangelist's name associated with illumination and learning.
Saint Luke was the author of the third Gospel and the Acts of the Apostles, and his cult was widespread across medieval Italy. Boys named Luca in his honour created patronymic families who became De Luca (of Luca's line) or Di Luca across the Italian peninsula. The De Luca form with the preposition de is particularly characteristic of southern Italy — Campania, Calabria, Basilicata — where the preposition-surname construction is very common.
De Luca is consistently one of Italy's ten most common surnames. The Italian-American community carries the name in large numbers, particularly in the New York metropolitan area, New Jersey, and Pennsylvania — reflecting the heavy Campanian and Calabrian emigration to the US between 1880 and 1924. In the US, the spelling DeLuca (no space) became common through anglicisation.
For genealogy research: De Luca records in southern Italy are held in the state archives (Archivi di Stato) of Naples, Salerno, Catanzaro, and Potenza. The Polo Archivistico di Napoli has extensive digitised records from the Napoleonic registration era (1809–1815) onward. For Italian-Americans: Ellis Island records (1892–1957) and the New York State Archives hold naturalization and immigration files.
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