NameCensus.

UK boy's name

Seamas

An Irish masculine name derived from the name James, meaning "supplanter" or "replacer".

For 2026, the newest official UK baby-name figures on this page are from 1999. That release is the current official benchmark rather than a forecast.

Seamas is a boy's name in the UK records. People looking for Seamas popularity in 2026 should use the latest official release, which is 1999 in this profile. In that release it ranked #2943, with 3 babies registered with the name. Its strongest year in the published records was 1999, with 3 births.

This profile covers 3 England and Wales registrations across 1 recorded years from 1999 to 1999. The figures come from ONS England and Wales, so the page is a view of published baby-name registrations rather than a forecast or a live count of people using the name today.

Seamas is at its recorded peak in the England and Wales series.

We estimate that about 3 living people in the UK are called Seamas. This uses published birth registrations from England and Wales, Scotland and Northern Ireland, then applies ONS national life tables to estimate how many are likely still alive. It does not forecast extra births for 2000 or 2026.

Key insights

  • Seamas ranked #2943 for boys in England and Wales in 1999, with 3 registrations.
  • The name peaked in 1999, when 3 boys were registered as Seamas.
  • About 3 living people in the UK are estimated to have Seamas as a first name, after adjusting past birth registrations with ONS life tables.

Latest rank (E&W)

#2943

1999

Births in 1999

3

Latest year

Peak year

1999

3 births

Estimated living

3

2026

Meaning

What does Seamas mean?

The given name Seamas is derived from the Irish Gaelic language and has its origins in early medieval Ireland. It is the Irish form of the name James, which itself is derived from the Hebrew name Jacob. The name Jacob is believed to have originated from the Hebrew word "ya'aqov," meaning "supplanter" or "one who follows."

In the early days of Christianity, the name James gained popularity due to its association with two of Jesus Christ's apostles, James the Greater and James the Lesser. This connection to biblical figures helped the name spread across Europe and eventually to Ireland, where it took on the form Seamas.

One of the earliest recorded instances of the name Seamas can be found in the Annals of the Four Masters, a chronicle of medieval Irish history compiled in the 17th century. The Annals mention a notable figure named Seamas mac Domhnaill, who lived in the 14th century and was a member of the powerful O'Donnell clan in Ulster.

Throughout Irish history, several notable individuals bore the name Seamas. Seamas Dall (James the Blind), who lived in the 17th century, was a renowned Irish harper and poet. His compositions played a significant role in preserving Irish cultural traditions during a time of English colonization.

Another prominent figure was Seamas Ó Muirí (1700-1782), a renowned Irish language scholar and lexicographer who compiled one of the earliest comprehensive dictionaries of the Irish language.

In the 19th century, Seamas Ó Conaill (1858-1929) was a prominent Irish nationalist and language revivalist. He played a crucial role in the Gaelic cultural revival movement and was a founding member of the Gaelic League, an organization dedicated to preserving and promoting the Irish language.

During the 20th century, Seamas Ó Riada (1938-1971) was a celebrated Irish composer and musician who helped popularize traditional Irish music and made significant contributions to the modern interpretation of Irish folk music.

While the name Seamas has deep roots in Irish history and culture, it has also been adopted and used in various forms across different languages and cultures, reflecting the widespread influence of the name James and its Hebrew origins.

Sourced from namecensus.com.

Decades

Seamas by decade

Decade totals smooth out the yearly jumps and make it easier to see whether Seamas was a short-lived spike or a name that stayed in regular use. Average rank is calculated only from years where a published rank exists.

Decade Average rank Total births Years covered
1990s #2943 3 1

Related

Names similar to Seamas

FAQ

Seamas: questions and answers

How popular is the name Seamas in the UK right now?

In 1999, Seamas was ranked #2943 for boys in England and Wales, with 3 births registered.

When was Seamas most popular?

The peak year on record was 1999, with 3 babies registered as Seamas in England and Wales.

What is the meaning and origin of Seamas?

An Irish masculine name derived from the name James, meaning "supplanter" or "replacer".

How many people are called Seamas in the UK?

A total of 3 babies have been registered as Seamas across the 1 years of ONS England & Wales records shown here.

Which records is this page based on?

The England and Wales timeline uses ONS baby-name records. Scotland figures come from NRS and Northern Ireland figures come from NISRA. Counts are registrations in published baby-name files. The living estimate uses those birth registrations with ONS national life tables.