In Donegal Costello has also been occasionally used as the anglicisation of O Casalaigh, more usually given as Cushley, and in Roscommon Casserley, from the original Mac Casarlaigh, has also at times been rendered as Costello.
In 1890 there were 142 births of the name, mainly concentrated in the four Atlantic counties of Limerick, Clare, Galway and Mayo.
John A. Costello (1891-1976) was Taoiseach (Prime Minister) of the Republic of Ireland from 1948 to 1951 and 1954 to 1957. He was responsible for finally taking the country out of the British Commonwealth in 1949. His son Declan Costello (1927 - ) was Attorney-General from 1973 to 1977 and was appointed President of the High Court in 1995.
Paul Costelloe (1945 - ) has acquired an international reputation as a fashion designer, and is particularly well-known for his use of Irish fabrics.
Elvis Costello (1950 - ) was born Declan McManus, the son of Irish parents who emigrated to London. He is one of the most original and influential songwriters of his generation.
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