Deasy
Deasy is a surname of Irish origin, known as Déiseach in Irish. There were 973 people recorded with the surname Deasy in the 1901 Irish census. Alternative spellings of Deacy and Deasey were less frequent, featuring 169 and 50 times respectively 

The name is featured in James Joyce's book Ulysses. At the time of publication the surname was mainly concentrated in County Waterford and in West Cork. Notable Deasys
Austin Deasy - Irish politician, who became minister for agriculture from 1982 to 1987. Bill Deasy - American singer-songwriter, recording artist and author
Conor Deasy - Irish pop band The Thrills singer
Daniel Deasy -  Democratic member of the Pennsylvania House of Representatives
Henry Hugh Peter Deasy - (1866-1947) automotive pioneer. John Deasy - Irish politician
Liam Deasy - Irish Republican Army officer during war of independence
Mike Deasy - Guitarist and member of The Wrecking Crew
Richard Deasy -  Irish lawyer and judge. Instituted the Deasy Land Act intended to reform tenants' rights. Friend and political ally of Daniel O'Connell. Rickard Deasy - Irish Farmers' rights campaigner
Timothy Deasy -  Captain in the Irish Republican Brotherhood. One of the prisoners rescued from a prison van in Manchester by Fenians in a famous incident in 1867. Tim Deasy - English footballer

References

Surnames of Irish origin