use american sources to trace back whatever side of your family you are searching for - then repost a specific query with names and dates. Clucas is a fairly common name on the Island and you will gain nothing from trying to research American BMDs whilst on the Island.
Clucas as a name is almost entirely manx - usually from south of Island - see www.manxnotebook.com/mnbweb2/manxnb/v03p083.htm