| Language | Latin, Norman French, Irish Gaelic |
|---|---|
| Origin | |
| Region of origin | Ireland, Normandy |
| Other names | |
| Variant form | Laffin |
Laffan is an Irish surname of Norman origin. The name is found most commonly in counties Tipperary and Wexford. Laffan in the Irish language is Lafán or Ó Laimhín
The historic seats of the Laffan family are Slade Castle on the Hook peninsula in County Wexford and Graystown Castle near Killenaule in County Tipperary.