onomasti
21
May

Dean

A form of Konstantinos

Constantine, in English

Saints Constantine and Helen — honoured together as Equals-to-the-Apostles.

It keeps the same day as the name it comes from — everything below is that name’s.

Recorded as a diaspora substitution — read how the names changed →

Origin

The story of Konstantinos

Konstantinos keeps 21 May — Saints Constantine and Helen, honoured together by the Church as Equals-to-the-Apostles.

The name is Latin in origin: Κωνσταντῖνος answers the Latin Constantinus, a pet form of the names Constans and Constantius — both meaning “constant, steadfast.”

“The steadfast one.”

onomasti · Konstantinos

Key facts

Konstantinos at a glance

Name day
21 May
This year · 2026
Thursday, 21 May
Next year · 2027
Friday, 21 May
Meaning
Κωνσταντῖνος — from Latin Constantinus, a pet form of Constans and Constantius, “constant, steadfast”
Patron of
Saints Constantine and Helen, Equals-to-the-Apostles

Variations

Forms & nicknames of the name

One name takes many forms — the formal, the everyday, the affectionate, and the spellings that travelled abroad. Each has its own page here, and all share the same day.

Greek forms

English & romanised

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