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The short answer
Diego is a masculine Spanish name, also used in Italian. Behind the Name calls it "possibly a shortened form of Santiago", and adds that in medieval records it was Latinized as Didacus, which led to the suggestion that it derives from Greek διδαχή (didache) meaning "teaching". Its origin is therefore genuinely disputed. Saint Didacus, or Diego, was a 15th-century Franciscan brother based in Alcalá, Spain. Behind the Name also names the painter Diego Velázquez, the muralist Diego Rivera and the footballer Diego Maradona as famous bearers. In the United States it ranked #158 for boys in 2025.
Meaning and etymology
Behind the Name gives two accounts. The first is that Diego is a Spanish name "possibly a shortened form of Santiago". The second follows from its medieval Latin form: "in medieval records Diego was Latinized as Didacus, and it has been suggested that it in fact derives from Greek διδαχή (didache) meaning 'teaching'". The entry presents both without choosing, so the etymology is marked disputed. Behind the Name lists Santi as a Spanish variant, Diogo and Tiago as Portuguese forms, Thiago as Brazilian Portuguese, Dídac as Catalan and Xanti as Basque, and notes the surnames Díaz, Diego and Díez as descendants.
Editorial confidence: disputed
Linguistic roots
| Language | Form | Meaning |
|---|---|---|
| Spanish | Santiago | possible source (Diego as a shortened form) |
| Medieval Latin | Didacus | Latinized form found in medieval records |
| Greek | διδαχή (didache) | teaching (suggested source via Didacus) |
Competing or overlapping origins
- A shortened form of Santiago, the Spanish name of Saint James.
- A derivation from Greek didache, "teaching", suggested on the strength of the medieval Latin form Didacus.
Popularity
Diego ranked #158 for boys in the United States in 2025 (Social Security Administration); Behind the Name reports the same 2025 US rank.
| Region | Year | Rank | Source |
|---|---|---|---|
| United States | 2025 | #158 | ssa-2025 |
Nicknames, variants, and related names
Nicknames: None documented.
Variants: Santi, Diogo, Tiago, Thiago, Dídac, Xanti, Didacus
Related names: Santiago, Díaz, Díez
What the name feels like
Diego is a warm, two-syllable Spanish classic whose ending vowel gives it an open, easy sound in English as well. It carries strong associations with Spanish and Latin American art and sport, and it travels well between languages without spelling changes.
Style tags: Spanish, classic, two syllables, cross-cultural, saint's name
Editorial interpretation: The style impressions above are editorial opinion, not fact. The English respelling DYE-go is the writer's approximation; the IPA shown is Behind the Name's Spanish pronunciation. The variant and related-name lists reproduce Behind the Name's entries; the entry gives no diminutives.
If you like this name
Names that share Diego's Spanish heritage, its sound or its cross-cultural classic feel. These groupings are editorial suggestions.
Similar by origin
Similar by sound
Similar by style
Frequently asked questions
What does the name Diego mean?
The origin of Diego is disputed. Behind the Name says it is possibly a shortened form of Santiago, but also notes that its medieval Latin form Didacus has led to a suggested derivation from Greek didache meaning "teaching".
Is Diego a Spanish name?
Yes. Behind the Name lists it as Spanish and Italian. Portuguese uses Diogo, Tiago and (in Brazil) Thiago; Catalan uses Dídac and Basque uses Xanti.
How popular is Diego in the United States?
Diego ranked #158 among boys' names in the United States in 2025, according to Social Security Administration data.
Sources
- Behind the Name: Meaning, origin and history of the name Diego — supports etymology, competing origins, saint, famous bearers, variants, pronunciation.
- U.S. Social Security Administration: Popular Baby Names — national data, year of birth 2025 — supports popularity.
