It keeps the same day as the name it comes from — everything below is that name’s.
Key facts
Kosmas at a glance
Name day
3 name days are kept — Greek custom keeps them all
This year · 2026
Wednesday, 1 July · Tuesday, 22 September · Sunday, 1 November
Next year · 2027
Thursday, 1 July · Wednesday, 22 September · Monday, 1 November
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
Kosmas you are hereCosmas
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