Mim Twm Llai Was A Recording Name Of Welsh Singer-Songwriter And Performer Gareth J Thomas From Bangor Wales Between 1997 And 2007 Thomas' Father Was Known As Mim Twm A Local Variant Of Meurig Thomas And A Neighbour Started Calling Thomas Mim Twm Llai Ie Smaller Mim Twm . He Now Uses The Name Gai Toms.