The Kewleys were quite common in Braddan, Marown, Douglas & Onchan. See a page on my site for a big problem I have with a Robert Kewley around this time: http://www.manxroots.com/mqkd1805.htm
If there is a chance, I will check the MI's for you & also look in the Newspaper Index which is good on most people of the status of farmer/tradesman & the better off.