18
Jan
Thanasis
A form of Athanasios
Athanasios, in English
Saint Athanasius the Great of Alexandria — kept on 18 January.
It keeps the same day as the name it comes from — everything below is that name’s.
Origin
The story of Athanasios
Athanasios keeps 18 January — Saint Athanasius the Great of Alexandria.
Ἀθανάσιος means “immortal” — the alpha-privative ἀ- against θάνατος (“death”).
“Immortal.”
onomasti · AthanasiosKey facts
Athanasios at a glance
Name day
18 January
This year · 2026
Sunday, 18 January
Next year · 2027
Monday, 18 January
Meaning
Ἀθανάσιος — “immortal”
Patron of
Saint Athanasius the Great of Alexandria
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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Namesakes
Notable people named Athanasios
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