MallowbyNames

Cathlyn

KATH-lin · A modern variant of Caitlin, which is the Irish form of Catherine, meaning 'pure'.

Peak popularity
1953
Usually for
Girls
Trend
Rising since 2022

A 1950s favorite, climbing again.

Popularity of Cathlyn since 1923

Babies named Cathlyn per year in U.S. Social Security records.

6121819602000Most births 1953Girls
Data table (by decade)
DecadeGirls
1920s5
1930s0
1940s52
1950s105
1960s44
1970s27
1980s22
1990s52
2000s37
2010s5
2020s12

Meaning & origin

Cathlyn first appeared in U.S. birth records in 1923, a modern variant of the classic Irish name Caitlin. After a period of obscurity, it saw a revival in the 1950s, reaching its peak popularity in 1953. In recent years, it has been rising in usage since 2022, though it remains rare and does not rank in the top 1000. This trend mirrors a broader interest in vintage and Celtic-inspired names. Despite its low frequency, Cathlyn offers a familiar sound with a distinct spelling, appealing to parents seeking a name that feels both traditional and unique.

Cathlyn is a modern respelling of Caitlin, the Irish Gaelic form of Catherine. Catherine ultimately derives from the Greek name Aikaterine, whose meaning is debated but commonly associated with katharos ('pure'). The name entered Irish usage through the Anglo-Norman invasion, and the spelling Cathlyn emerged in the 20th century as a variant aiming for a simplified or more phonetic English rendering.

Nicknames & variants

Nicknames: Cathy, Cath, Lyn

Variants: Caitlin, Catherine, Kathleen, Cathleen, Katherine

Sibling names for Cathlyn

Names that share Cathlyn's style, for a brother or sister.

A parent animal hugging its little one, the personalized name page

C is for Cathlyn, our favorite little girl.

C is for Cathlyn…”

In a Mallowby alphabet book, Cathlyn's letter becomes Cathlyn's page: hand-illustrated, printed hardcover or paperback, made just for them.

Make Cathlyn's book

Books for siblings or grandkids? The second book is 15% off.

Questions parents ask

What does Cathlyn mean?
Cathlyn is a variant of Caitlin, the Irish form of Catherine, which traditionally means 'pure'.
How popular is Cathlyn currently?
Cathlyn does not rank in the top 1000 U.S. births for 2025, its latest recorded year. Its peak usage was in 1953.
Is Cathlyn a girl's name?
Yes, Cathlyn is predominantly used as a girl's name.