How common is the name Declan Sullivan?

The first name Declan is shared by approximately 280K people worldwide. The surname Sullivan is among the most recognizable in its region of origin.

Where is the name Declan most common?

The name Declan is most prevalent in Ireland and surrounding regions.

When was Declan most popular?

The name Declan reached its peak popularity during the 1985s.

Declan Sullivan — Name Meaning, Origin & Statistics

Declan Sullivan is a name that combines Celtic origins. The first name Declan is a masculine given name of Celtic origin. From Irish Gaelic Deaglán, of uncertain meaning. Saint Declan of Ardmore was one of the pre-Patrician saints of Ireland. The surname Sullivan: A name of English origin (Old English / Anglo-Saxon). Its precise etymology is not fully documented, but it belongs to the broad tradition of English names found across many cultures. Declan is a well-known first name, carried by approximately 280K people globally, with the highest concentration in Ireland. The name Declan reached peak popularity in the 1985s, reflecting the naming trends of that era.

Etymology & Origin

First Name: Declan

Meaning: man of prayer

Celtic

From Irish Gaelic Deaglán, of uncertain meaning. Saint Declan of Ardmore was one of the pre-Patrician saints of Ireland.

Surname: Sullivan

English

A name of English origin (Old English / Anglo-Saxon). Its precise etymology is not fully documented, but it belongs to the broad tradition of English names found across many cultures.

Geographic Distribution

The first name Declan is distributed across the globe, with the highest concentrations in the following countries:

Ireland 45%

United Kingdom 30%

United States 15%

Australia 9%

Popularity Over Time

Popularity of the name Declan by decade, based on birth registration data:

1900s

1910s

1920s

1930s

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1950s

1960s

1970s

1980s

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2020s

Name Variants & Related Names

The name Declan has several variants and related forms across different languages and cultures:

Deaglán
Dec

Numerology

According to Pythagorean numerology, each letter in a name carries a numerical value. Here are the key numbers for Declan Sullivan:

5

Expression Number

Freedom and adaptability. A dynamic, versatile personality that embraces change and seeks new experiences.

1

Soul Urge Number

Leadership and independence. This number suggests a self-reliant, ambitious and pioneering personality that forges its own path.

4

Personality Number

Stability and hard work. Represents practicality, reliability and dedication — someone who builds solid foundations.

Numerology is a cultural tradition for exploring symbolism in names. Results are for entertainment purposes.

Frequently Asked Questions

What is the origin of the first name Declan?: The first name Declan originates from Celtic. From Irish Gaelic Deaglán, of uncertain meaning. Saint Declan of Ardmore was one of the pre-Patrician saints of Ireland.
How common is the name Declan Sullivan?: The first name Declan is shared by approximately 280K people worldwide. The surname Sullivan is among the most recognizable in its region of origin.
Where is the name Declan most common?: The name Declan is most prevalent in Ireland and surrounding regions.
When was Declan most popular?: The name Declan reached its peak popularity during the 1985s.