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

Glennon, 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 Glennon surname is from the 2010 census data.

Popularity of Glennon in America

Glennon is the 9165th most popular name in America based on the data we have collected from the U.S. Census Bureau.

The Glennon surname appeared 3,561 times in the 2010 census and if you were to sample 100,000 people in the United States, approximately 1 people would have the surname Glennon.

We can also compare 2010 data for Glennon 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 Glennon

The surname Glennon has its origins in Ireland, where it first emerged as a Gaelic Irish name during the Middle Ages. It is derived from the Irish Gaelic word "glennan," which means "glen" or "valley." This suggests that the name may have originally referred to someone who lived in or near a valley or glen.

One of the earliest records of the name can be found in the Annals of Ulster, a chronicle of medieval Irish history. The entry for the year 1395 mentions a Donaldus Glennan, who was likely an early bearer of the Glennon surname.

During the 16th and 17th centuries, the name Glennon was particularly prevalent in County Armagh and County Fermanagh, in the northern part of Ireland. It is believed that the name may have originated in one of these counties, where many families bearing the surname resided.

In the late 16th century, a notable figure named Hugh Oge Glennon was recorded as the chief of the Glennon clan in County Fermanagh. This suggests that the Glennons were a prominent family in the area during that time period.

Another historical figure with the Glennon surname was William Glennon, who was born in County Armagh in 1776. He was a prominent Irish Catholic priest and educator, and served as the president of the Royal College of St. Patrick in Maynooth, Ireland, from 1813 to 1837.

In the 19th century, the Glennon name spread beyond Ireland as many Irish families emigrated to other parts of the world, including the United States, Canada, and Australia. One notable bearer of the name was Richard Glennon, who was born in County Fermanagh in 1849 and later became the Archbishop of St. Louis, Missouri, serving from 1903 to 1946.

Other notable individuals with the Glennon surname include Brendan Glennon (1913-1995), an Irish playwright and novelist, and John Joseph Glennon (1862-1946), an American prelate who served as the Archbishop of St. Louis from 1903 to 1946.

While the Glennon surname has roots in Ireland, it has since become more widely dispersed across various parts of the world, with many families continuing to bear this name and its various spelling variations.

Race and ethnic origin of people with the last name Glennon

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

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 Glennon 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 Glennon 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 Glennon was researched and written by our team of onomatology and genealogy experts.

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

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