What is the origin of the last name Costello?

The last name Costello has origins in Ireland, specifically among the Gaelic population. It is derived from the Gaelic name Mac Coisdealbha, which means "son of the victorious one." The name signifies those who were descendants of a person with a notable victory or triumph. Over time, the spelling and pronunciation changed, and the name Costello emerged. Today, Costello can be found as a surname in various countries, particularly in Ireland and among Irish diaspora communities around the world.

Countries of origin for the last name Costello

The surname Costello can be traced back to its origins in Ireland. The name is of Gaelic origin, derived from the Gaelic word “Mac Oisdealbhaigh,” meaning “son of Oisdealbhach.” This Gaelic personal name is composed of the elements “os,” meaning “deer,” and “dealbhach,” meaning “like.” Therefore, the name Costello can be interpreted as “son of the deer-like one.”

The Costello surname is primarily associated with the western region of Ireland, particularly in County Mayo and County Galway. Over time, individuals bearing the name Costello migrated to other parts of Ireland and later emigrated to different parts of the world, including the United States.

Upon arrival in the United States, many Costellos settled in cities such as New York, Boston, and Chicago. They contributed to the cultural fabric of their new home and played roles in different sectors, including politics, law, business, and entertainment.

One notable figure with the surname Costello is Frank Costello, also known as “The Prime Minister of the Underworld.” He was a prominent Italian-American gangster during the Prohibition era and played a significant role in organized crime in New York City.

Another prominent individual with the surname Costello is Dolores Costello, a celebrated actress during the early years of Hollywood. She appeared in numerous silent films and later transitioned to talking pictures, gaining recognition for her talent and beauty.

Throughout generations, variations of the Costello surname have emerged, including O’Costello, Costellow, and Costelloe. These variations reflect regional dialects and pronunciation preferences within Ireland.

Exploring the etymology of the Costello surname provides insight into the historical and cultural roots of individuals bearing this name. The Gaelic origins and associations with deer-like qualities suggest connections to nature, strength, and agility. These meanings resonate with the shared heritage and values of those with this surname.

While the historical and etymological aspects of the Costello surname provide a comprehensive understanding of its origins, the full depth of its significance continues to evolve with each new generation. The ongoing stories, achievements, and connections of individuals bearing the Costello name contribute to the ever-expanding narrative of this surname.

Interesting facts about the last name Costello

  • The surname Costello is of Irish origin and is derived from the Gaelic name “Mac Coisdealbha”, which means “son of Costello”.
  • Costello is commonly found as a surname in Ireland, especially in the provinces of Connacht and Munster.
  • The name Costello is believed to have been derived from the Old Irish word “coisdealbh”, which can be translated as “victorious in battle” or “maker/slayer of warriors”.
  • Costello has been used as both a given name and a surname in Ireland for centuries.
  • The Costello family was historically associated with the kingdom of Hy-Many in County Galway, Ireland.
  • Notable individuals with the surname Costello include American singer and songwriter Elvis Costello and Irish politician Joe Costello.
  • The name Costello has various spelling variations, including Mac Costello, Mac Costalow, McCostello, and McCostalow.
  • During the Irish diaspora, many Costellos emigrated from Ireland to other countries, including the United States, Canada, Australia, and Great Britain.
  • The Costello surname is relatively common in Ireland, ranking among the top 100 most frequently found surnames in the country.
  • Some variations of the Costello surname have been anglicized to other forms, such as Costelloe or Costellow.

Name Rank


There are around 32043 people with the last name Costello in the US

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