My grandmother was a Petticrew from Northern Ireland- there is a big family of Petticrews in Glenarm Co Antrim, also known as Tickmacreven in the census. You could start there. I have a James Petticrew in my line and this goes back to an Ever Petticrew in the 1700 or 1800s. There are a few Petticrews buried in GlenarmI think Glenarm is the ancestral home for Petticrews with a C as opposed to the more common spelling of Pettigrew with G-however the spelling does change a bit. The author Felix McKillop has written a couple of books about Glenarm with reference to this family.Also check out Glenarms website. Best of luck.