Family name Ohagan (Ohagan 
) , worldwide, is quite a rare surname. The surname Ohagan is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, and Philippines, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Philippines.
| VARIANT | COUNTRY |
|---|---|
| Ohagan | Australia, Philippines, Ireland, United Kingdom, United States |
| henry ohagan O'Hagan, Henry Osborne (1853–1930), company promoter (b. 1853) |
|