Grehan

Grehan is a surname. Notable people with the surname include:


 * Ceara Grehan, Northern Irish theatrical and opera singer
 * Derry Grehan (born 1957), Canadian guitarist
 * Francie Grehan, Gaelic footballer
 * James Grehan (disambiguation), multiple people
 * Martin Grehan (born 1984), Scottish footballer
 * Stephen Grehan (born 1971), Irish retired hurler