1) Anglicised Irish surname 
Haughn is an Irish surname. It is a reduced form of an Anglicisation of the Irish language Ó hEacháin, meaning `descendant of Eachán`. The personal name Eachán is a diminutive of the name Eachaidh, meaning `horse`. Eachaidh is a byname meaning `horseman`; the name is derived from each, meaning `horse`. ...