Find out how popular the last name Deasy is in the United States and learn more about the meaning, history, and race and ethnic origin of people in America who are named Deasy.

Deasy, like all of the last names we have data for, is identified by the U.S. Census Bureau as a surname which has more than 100 occurrences in the United States in the Decennial Census survey. The most recent statistics we have for the Deasy surname is from the 2010 census data.

Popularity of Deasy in America

Deasy is the 24388th most popular name in America based on the data we have collected from the U.S. Census Bureau.

The Deasy surname appeared 1,027 times in the 2010 census and if you were to sample 100,000 people in the United States, approximately 0 people would have the surname Deasy.

We can also compare 2010 data for Deasy to data from the previous census in 2000. The table below contains all of the statistics for both years in a side-by-side comparison.

The history of the last name Deasy

The surname Deasy is of Irish origin, tracing its roots back to the County Cork region of southwestern Ireland. It emerged during the Middle Ages, derived from the Gaelic-Irish Ó Déisí, meaning "descendant of Déisi." The Déisi were an ancient Irish clan based in the present-day County Waterford area.

One of the earliest recorded references to the name Deasy can be found in the Annals of Inisfallen, a chronicle of medieval Irish history compiled by monks in the late 12th century. The annals mention individuals with the surname Deasy living in the Cork and Waterford regions during that time period.

In the 16th century, the Deasy surname appeared in various historical documents, such as the Fiants of the Tudor Sovereigns and the Patent Rolls of the English Crown in Ireland. These records often listed land grants and appointments to positions of authority for members of the Deasy family.

One notable figure bearing the Deasy name was Sir Maurice Deasy (c. 1570-1636), a wealthy landowner and member of the Irish Parliament during the reign of King James I. Another prominent individual was Rickard Deasy (c. 1612-1668), who served as the High Sheriff of County Cork in 1662.

During the 17th and 18th centuries, the Deasy surname became more widespread across Ireland, particularly in the counties of Cork, Waterford, and Tipperary. Some variations in spelling emerged, including Deasey, Deassy, and Deecy, reflecting the fluid nature of surname spellings in that era.

In the literary realm, Thomas Deasy (1818-1883) gained recognition as an Irish poet and journalist, publishing several volumes of poetry throughout his lifetime. Another notable figure was Richard Deasy (1838-1915), a renowned educator and founder of several schools in Ireland.

As the Deasy family dispersed across Ireland and beyond, the surname continued to appear in various historical records and accounts. John Deasy (1856-1932), a prominent Irish Nationalist and Member of Parliament, was a key figure in the struggle for Irish independence in the early 20th century.

Race and ethnic origin of people with the last name Deasy

We also have some data on the ancestry of people with the surname Deasy.

The below race categories are the modified race categories used in the Census Bureau's population estimates program. All people were categorized into six mutually exclusive racial and Hispanic origin groups:

1. White only
2. Black only
3. American Indian and Alaskan Native only
4. Asian and Pacific Islander only
5. Hispanic
6. Two or More Races

For the most recent 2010 census data, the race/ethnic origin breakdown for Deasy was:

Note: Any fields showing (S) means the data was suppressed for privacy so that the data does not in any way identify any specific individuals.

Since we have data from the previous census in 2000, we can also compare the values to see how the popularity of Deasy has changed in the 10 years between the two census surveys.

Data source

The last name data and ethnic breakdown of last names is sourced directly from the Decennial Census survey, conducted every 10 years by the United States Census Bureau.

The history and meaning of the name Deasy was researched and written by our team of onomatology and genealogy experts.

If you have a correction or suggestion to improve the history of Deasy, please contact us.

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