Katelyn
Meaning
modern spelling of Caitlin, the Anglicized Irish form of Catherine
The story
Katelyn is a modern English spelling of Caitlin, the Anglicized form of Irish Caitlín and ultimately a member of the Catherine family. It is not simply Kate plus a decorative -lyn ending, even though the spelling makes that modern reading tempting. Katelyn belongs to a much larger cluster that includes Caitlin, Caitlyn, Kaitlin, Kaitlyn, Katelin, and Katelynn. Each spelling has its own American curve. Katelyn begins to register in the 1970s, rises sharply through the 1980s and 1990s, reaches its displayed high point in the 2000s, and then declines through the 2010s and 2020s. That arc gives this exact spelling a strong generational stamp while its family history runs back through Irish and French forms. Katelyn is both a late twentieth-century spelling choice and a branch of one of Europe's oldest traveling name families.
Katelyn 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
Popularity, 1890–2024
Shape drawn from US Social Security baby-name records. Katelyn peaked in the 2000s.
See popularity in Brazil
Popularity in Brazil
520 people · the #13,009 first name in Brazil · about 1 in 333,333 · median age 16
Among people named Katelyn living in Brazil at the 2022 census, more were born in the 2000s than in any other decade.
The census also counted 23 born between 2020 and August 2022, too recent a span to chart.
Source: IBGE, Censo Demográfico 2022
How the spellings raced
Across these spellings, Kaitlyn led in the group’s busiest decade, the 1990s. So far in the 2020s, Kaitlyn leads.
Decade totals from US Social Security birth registrations. Every line uses the same scale. The 2020s covers 2020–2025.
When you meet Katelyn
Most people given the name Katelyn in the United States were born between 1990 and 2009. The Katelyn you meet today is most often in her 20s or 30s.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
The Katelyn deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Katelyn 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 Katelyn fits with your family’s names and surname.
Does Katelyn fit YOUR family?
nametree reads your family’s names and finds the ones that belong. Free, private, no ads.
Add Katelyn to your family’s tree →