Many thanks for your reply to my post. My husband's family had always thought the surname to be of Welsh origin, and that the Flewellins moved from the Welsh coalfields to the Castlecomer area. However the Yorkshire link seems very likely, given that there are so many Flewellin records there. My husband's great great grandfather Thomas Flewellin certainly leased land from the Wandesforde family and other also Flewellins (various spellings)appear in the Griffiths records. Thanks for your suggestions.