Cant find any farm called that the only place with that name is Lon Crecrist Trearddur Bay which is a name of a road . If you contact Anglesey Archives they will help you with your question you can go on their website download a search application or If someone who is going there can have a lookup for you. Llanfair yn Nuebwll also takes in Rhoscolyn and part of Caergeiliog I will check census for you.