I'm also researching the surnames Ryan and Costigan in Spaniard's Bay. Also the surname Ford from Island Cove area. I have 3 John Ryan's in my family tree program but neither one is married to Johanna Costigan. The Johanna Costigan that I have listed was from Harbour Main and she was married to Patrick Corbett.
I also have 3 William Ford listed in my family tree. The first one is from Island Cove married Johanna Quilty. The second one married Joyce Bennett and the third William married a Candace Mercer.
I would be interested in sharing information on these surnames with you. If you are interested contact me off list at email@example.com