Kasia
Feminine · “Contested”
Kasia is what Polish does to Katarzyna, and Poland does it to almost every name: strip the formal form to a syllable or two and add an affectionate ending. Kasia is the everyday name of a very large number of Polish women.
How old is the name Kasia?
Kasia first appears in US birth records in 1958 — 67 years ago. The typical Kasia alive today was born around 2001, making them about 24 years old. About 1,700 people named Kasia are estimated to be alive in the US today.
When was the name Kasia most popular?
Kasia peaked in 2002, reaching #2288 nationally. Today it ranks #5410, 3,122 places below that high. See the whole 2002 chart.
Lists built from the same records:
Where it comes from
From Aikaterine to Kasia
The story of Kasia
Catherine of Alexandria was among the most venerated saints of medieval Europe and her name spread into every language; Polish took it as Katarzyna and made Kasia, Kaśka and Kasieńka from it. Polish diminutives are an entire grammar of their own, layered so that a single name can generate a dozen forms of increasing affection. Kasia is the ordinary everyday one. Polish immigration brought it to America, and its record here is small and steady rather than dramatic; the peak in 2002 belongs partly to Polish-American families and partly to non-Polish families who met the name and liked the sound.
Meaningscholars disagree
Contested; the parent name's meaning is unknown
Kasia is the Polish diminutive of Katarzyna, from Greek Aikaterine, whose meaning is genuinely unsettled. The traditional reading pure comes from a later association with katharos and is a Christian reinterpretation rather than the original etymology. The name's true source is unknown. Kasia carries whatever Katarzyna carries and adds the Polish diminutive -sia.
How the name formed
- Aikaterine
- Katarzyna
- Kasia
Related forms: Kasia · Katarzyna · Katherine · Katya
Pronouncing Kasia
KAH-shah
Two syllables, stress on the first. In Polish the si is a soft sh sound, so the name is KAH-shah rather than KAY-see-uh, which is what an English reader produces on sight.
Nicknames for Kasia
Moderate
What the data says
146 years of official birth records
The long climb, and where it stands now
The same years in position rather than babies
- First recorded
- 1958
- Most girls named
- 200271 — the highest on record
- Peak rank
- #2288reached in 2002
- Change vs 2024
- +4.5%23 in 2025, from 22
Rank is a position, a count is a headcount, and they move independently — a name can hold its rank while the number of babies behind it falls. Source: U.S. Social Security Administration.
Kasia in other languages
The same name elsewhere
- Kasia in Polish — same name
- Katarzyna in Polish — related form
- Katherine in English — related form
- Katya in Russian — related form
Strongest US states over the last decade: California, Illinois.
Kasias among us
people named Kasia are estimated to be alive in the US today
About 1 girl in 69,881 born in 2025 was named Kasia
Estimated from SSA birth records and published actuarial life tables. Method
Spellings of Kasia
- #5410
- Kasia on the 2025 chart
- #770
- counting every spelling
The SSA counts spellings, not names. Kasia went to 23 girls in 2025, but Kaziah, Kaziyah and Kasiah and the rest below are the same name said out loud. Together the 10 spellings went to 190, which makes it the 770th most-given girls’ name of the year — 4,640 places above the chart.
- Kaziah60
- Kaziyah35
- Kasia23
- Kasiah23
- Kasiyah17
- Kasiya8
- Kaziya7
- Kazyiah7
and 2 rarer spellings.
About 1 girl in 8,459 born in 2025 was given one of these spellings — against 1 in 69,881 for Kasia itself.
Spellings are grouped by a fixed rule that folds interchangeable English spellings of one sound (ck/k, ph/f, x/ks, a non-initial y for i) and keeps vowels apart, so Sean and Shawn stay separate names. It errs towards splitting: a family here is never larger than the truth. SSA national data, 2025. Method
Is it right for you
What happens to a name after it peaks
The Melvena test
Every popular name lives one long story — a climb, a peak, a slow settling back. Kasia's later chapters haven't been written yet, so we borrowed them: Melvena climbed just as high around 1934, and its whole arc is on record. Line the two peaks up, and Melvena's path sketches the road Kasia is walking now.
Kasia sits in the calm middle of the cycle — neither chasing a wave nor sliding off one. Middle-of-the-cycle names age slowly and predictably.
A scored estimate from 146 years of naming cycles — not a prophecy. Great names outlive statistics. How this is scored
Kasia beside its neighbors
The names ranked closest to Kasia in 2025, in babies rather than position — the bars are to scale.
US girls given each name in 2025.
The trade-off
- It connects to one of the largest name families in Europe.
- Kate is available instantly as an English form.
- Five letters and two syllables keep it compact.
- English readers will not guess the Polish sh sound.
- It reads as a diminutive in Poland, where the full name is Katarzyna.
- The traditional meaning pure is a later reinterpretation, not the etymology.
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What they receive
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Kasia
Feminine · #5410 in the U.S.
Frequently asked
- How many Kasias are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 1,700 people named Kasia are estimated to be alive in the US today.
- How do you spell Kasia?
- Kasia is one of 8 recorded spellings. Kaziah is the more common one — 60 births in 2025 against 23 for Kasia.
- How popular is the name Kasia in 2025?
- Kasia ranks #5410 among US girl names in 2025, with 23 babies given the name.
- How rare is the name Kasia?
- About 1 in every 69,881 US girls born in 2025 was named Kasia — 23 in all.
- Will my child share the name Kasia with classmates?
- Kasia will almost certainly be the only one in school.
Ranked beside Kasia
Names sitting at a similar level of popularity right now.
Aina#5410 · Sherry#5410 · Kathia#5410 · Taj#5410 · Analicia#5410 · Divya#5410 · Halimah#5410 · Leo#5410
Looking for what else is popular rather than what resembles Kasia? See the current top 100.
Choosing between Kasia and another name?
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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