Well, this may be a stretch, but maybe not. I have just found connections between Brewster, Porter, and Cowan families of Streetsboro, Portage Co., OH, so when I did the search on Cowans in this county and found your message with "Streetsboro" included I thought I'd better check with you. Do any of the above connections sound familiar to you? These families removed to Fresno, CA, in the early 1900s. Martin Porter and wife Hannah Jane Cowan had daughters Anna and Martha who married Brewster brothers.
Look forward to hearing from you.