Kaj

Boy name

Kaj has been given to 515 babies in the U.S. since 1956. It peaked in 2006. In 2025, about 1 in 341,615 boys was named Kaj.

Popularity over time births per year, 1880–2025

Hover or tap the chart to read any year.

Total babies

515

Peak year

2006 (20 babies)

Rank in 2025

Below top 1000

First recorded

1956

10-year trend

▼ -67%

Gender split

All boys

Spellings & variants

Names one letter away from Kaj — alternate spellings parents actually use.

Kaygirl

102,545 babies since 1882

Kaiboy

78,710 babies since 1926

Tajboy

6,290 babies since 1965

Ajboy

2,499 babies since 1961

Rajboy

2,176 babies since 1950

Kamunisex

1,353 babies since 1914

Names with a similar vibe

Same primary gender, peaked around the same years, and roughly as common as Kaj.

Jerrinboy

515 babies since 1977

Calibboy

515 babies since 1983

Aveonboy

515 babies since 1992

Aymenboy

516 babies since 1984

Seijiboy

517 babies since 1914

Katrellboy

517 babies since 1971

Malakyeboy

517 babies since 2001

Quintrellboy

513 babies since 1976

Kaj vs Jerrin ⚖Kaj vs Calib ⚖Kaj vs Aveon ⚖Kaj vs Aymen ⚖

FAQ

How popular is the name Kaj?

Kaj has been given to 515 babies in the U.S. since 1956. It ranked below the top 1000 in 2025.

When did the name Kaj peak?

Kaj peaked in 2006, when 20 babies were given the name.

Is Kaj a girl or boy name?

Kaj is primarily a boy name (100% of babies named Kaj are boys).

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