What is the origin of the last name Casey?

The last name Casey has its origin in Ireland and is derived from the Gaelic surname Ó Cathasaigh. This surname is believed to have originated from the personal name Cathasaigh, meaning "vigilant" or "watchful". Over time, the prefix "Ó" meaning "descendant of" was added to form the patronymic surname Ó Cathasaigh, which eventually evolved into Casey. The name Casey is now fairly common in Ireland, and it has spread worldwide through Irish emigration.

Countries of origin for the last name Casey

The last name Casey is a surname of Irish origin. It is derived from the Gaelic word “Cathasaigh,” which means “watchful” or “vigilant.” This surname has a long history in Ireland and has spread to other parts of the world, including the United States. The following analysis explores the meaning and significance of the Casey surname for a US audience.

The Casey surname is predominantly found in County Cork and County Dublin in Ireland, indicating its strong Irish roots. It is estimated that there are approximately 55,000 people with the surname Casey in the United States, making it a relatively common surname. However, it is important to note that the Casey surname can also be found in other countries with Irish diaspora.

Given its Gaelic origins, the surname Casey signifies an ancestral connection to Ireland and reflects the rich cultural heritage of the country. The original meaning of “watchful” or “vigilant” suggests that those bearing the Casey surname may have had a role as guardians or sentinels in their communities. This interpretation highlights the importance of vigilance and responsibility, which may have been valued traits within Irish society.

The Casey surname has a notable history, with various individuals who have contributed to different fields. One prominent figure is George Washington Casey, a major-general who served in the Union Army during the American Civil War. His military career exemplified the valor and dedication often associated with the Casey surname.

Another notable individual is George Shepperd Casey Jr., who served as the 36th Chief of Staff of the United States Army. His leadership and achievements within the military have undoubtedly brought recognition to the Casey surname.

The Casey surname has also made its mark in the world of entertainment. Irish-American actor Sean Casey, known for his role in the television show “Mitzi McCoy,” and Irish singer-songwriter Paul Casey are examples of individuals who have contributed to their respective fields while carrying the Casey surname.

The meaning and significance of the Casey surname extend beyond individuals. It represents a connection to Irish ancestry and a shared history. It serves as a reminder of the values and traits that have been associated with the Casey family throughout generations.

In conclusion, the Casey surname is of Irish origin, derived from the Gaelic word “Cathasaigh,” meaning “watchful” or “vigilant.” With a strong presence in Ireland and the United States, the Casey surname signifies a connection to Irish ancestry and reflects the cultural heritage of the country. Notable individuals bearing this surname have contributed to various fields, including the military and entertainment. The Casey surname represents a sense of guardianship and responsibility, reflecting the values associated with it. Its rich history and diverse representations highlight the enduring significance of the Casey surname for individuals and communities.

Interesting facts about the last name Casey

  • The surname Casey is of Irish origin.
  • It is derived from the Gaelic word “O Cathasaigh,” which means “descendant of Cathasach,” an old Irish personal name.
  • The Casey family is one of the prominent “septs” of County Cork in Ireland.
  • Some sources suggest that the surname may also have an English origin, derived from a medieval English given name “Cassy” or “Casey.”
  • Casey is a fairly common surname in Ireland, particularly in County Cork, County Kerry, and County Dublin.
  • The name Casey has spread to other parts of the world, including the United States, Canada, Australia, and the United Kingdom, due to Irish emigration.
  • Famous individuals with the surname Casey include Al Casey (renowned American jazz guitarist), John Casey (American author), and Bernie Casey (American professional football player and actor).
  • The Casey family played a significant role in the Irish War of Independence and the Irish Civil War in the early 20th century.
  • The Casey Clan is associated with the modern-day Clan O’Keeffe, as the two families merged through marriage in the 16th century.
  • The Casey surname has several different variations, including O’Casey, O’Kacey, Kacey, Keecey, and Kacey.

Name Rank


There are around 66556 people with the last name Casey in the US

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