https://en.wikipedia.org/wiki/Griffin_(surname)
The name O’Griffin / Griffin comes from the legendary monster ‘the gryphon’, and was often used to describe someone fierce or dangerous. The name originated in two distinct areas in Ireland – in Ballgriffin in County Kerry, and Ballygriffy in County Clare. Griffin is now the 75th most numerous surname in Ireland, and is most common in the original counties of Clare and Kerry, as well as in Limerick and Cork.
It seems there is not an active clan organisation for your name, at this time.
However, the revival of interest in Irish culture and heritage over the past 100 years has led to the revival of many Irish Clans. In more recent times, increased access to historical archives online, DNA testing and ease of travel to Ireland has led many individuals to explore their own genealogy and connections to Irish Clans. Some of these have gone on to establish Clan Associations in Ireland, the USA, the UK, Canada, Australia, New Zealand and anywhere that the Irish Diaspora has found itself.
Clans of Ireland Ltd invite those interested in Irish Clans to contact them with a view to explore the possibility of reviving your Irish Clan.