Clàrsach or Cláirseach (Scottish Gaelic and Irish spellings, respectively), is the generic Gaelic word for 'a harp', as derived from Middle Irish. In English, the word is used to refer specifically to a variety of small Irish and Scottish harps.
The use of this word in English, and the varieties of harps that it describes, is complex and is a cause of disagreement.
By and large, in English, the word clàrsach is equivalent to the term Irish harp, the former being preferred in Scottish contexts and the latter in Irish contexts. The less specific term Celtic harp has also come into use since the mid 20th century but is not preferred by Irish or Scottish natives to refer to their instruments.
The Scottish Gaelic term for the harp of the Gael is clàrsach Ghàidhealach, and cláirseach Ghaelach in Irish, meaning Gaelic harp.
Read more about Clàrsach: Gaelic Words For Harps, Historical Gaelic Harp, Modern Clàrsach or Irish Harp, Revival