Hi Glenn,
No I'm sorry I can't make the link back although I do have Karrans in another part of my family!My grandmother was a Karran from Ballakillowey, Rushen, and I have copies of her Karran line (seems to all be in the South of the Island)going back to John Karran and Margaret Maddrell who died 1719 & 1729 respectively.
Catherine.