Kay
Meaning
diminutive of Katherine, traditionally pure
The formal names behind Kay
Kay is an established short form of each of these names.
Katherine · Greek origin · linked since early Christian times to katharos, "pure," though the name's true root is older and debated; borne by saints, empresses of Russia, and centuries of English queens consort. The K-classic behind Kate, Katie, Kay, and Kitty
Catherine · Greek origin · traditionally "pure"
Kay around the world
One shared root links 26 names across 8 languages.
Shared root: from Greek Aikaterine, linked since early Christian times to katharos "pure", though the name's true origin predates that folk etymology
The constellation
18 more branches of this family
Sources list Kay among the forms of Nicholas (Danish · Dutch · Frisian · German · Norwegian · Swedish).
Popularity, 1890–2024
Shape drawn from US Social Security baby-name records. Kay peaked in the 1930s and the 1940s in nearly equal measure.
See popularity in Brazil
Popularity in Brazil
135 people · the #33,416 first name in Brazil · about 1 in 1,000,000 · median age 26
Among people named Kay living in Brazil at the 2022 census, more were born in the 2000s than in any other decade.
Source: IBGE, Censo Demográfico 2022
When you meet Kay
Most people given the name Kay in the United States were born between 1940 and 1969. The Kay you meet today is most often in her 60s or 70s.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
The Kay deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Kay truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Kay fits with your family’s names and surname.
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