Cognomen Gilboy (Gilboy 
) , all over the world, is quite a rare surname. The family name Gilboy is habitual in Ireland, where it is quite a rare surname, Philippines, where it is a rare surname, and the United Kingdom. In absolute terms, it is commonest in Philippines, the United States, and the United Kingdom. Very seldom, Gilboy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gilboy | United Kingdom, Australia, Ireland, United States, Philippines |
|
bertram gilboy English footballer (1894-1974), GB (b. 1894) |
|
| w. j. gilboy Member of the Wisconsin State Assembly, US (b. 1876) |
|
|
| elizabeth waterman gilboy Ph.D. Radcliffe College 1929, US (b. 1903) |
|
|
| magaretta goldstein gilboy 1943 - present | American | Painter, Printmaker (b. 1943) |
|
|
| jim gilboy college basketball player (1956–1957) Detroit Mercy |
|