Kasia
The everyday short form of Katarzyna, a Greek name whose sense of "pure" attached later, borrowed from katharos. As an official first name Kasia is rare: for most Poles it's a nickname, not the one on the birth record.
Kasia Pronunciation
Kasia is pronounced KAH-shah (/ˈkaɕa/).
What Kasia means
Where Kasia comes from and what it has meant to the people who carry it.
Kasia is the everyday form of Katarzyna, the Polish version of a Greek name that reaches back to Aikaterine. Nobody agrees on what that first Greek name meant. The sense of "pure," czysta, was attached later, once people linked the name to the Greek word katharos, "clean" or "clear." So the meaning grew onto the name rather than starting there.
On a class register a teacher reads Katarzyna, and three girls answer to Kasia. That shift, from the full form to the short one, is where the name actually lives for most who carry it. Katya belongs to the same family, the variant you meet in Russian and Ukrainian.
The saint's day falls on the 25th of November, and Kasia has her imieniny then along with every Katarzyna. Diminutive though it is, Kasia stands on its own now. It goes on birthday cards. It goes on coffee cups. What began as a Greek name, softened through Katarzyna, ends as one clear word: Kasia.
How many people are named Kasia
1 in 113286 women in Poland is named Kasia. 199 people carry it in the 2025 register: rank #2231 among female names.
Kasia's popularity over time
Fewer than 2 girls were given the name in 2025. It has been stable for a decade.
Kasia as a middle name
Kasia is a first name for 199 women in Poland and a middle name for another 92, a 68/32 split. In the women's middle-name ranking it sits 696th, between Aria (92) and Belen (91).
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#694 Matilda93
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#695 Aria92
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#696 Kasia92
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#697 Belen91
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#698 Betina91