see http://www.isle-of-man.com/manxnotebook/gazateer/inns/do_ae.htm (and use search engine on redfern etc) - therer was a james redfern in 1819 - they were associated with a major hotel in Douglas in early part of 19th C.
Prob same family is Ross Redfern in 1789 - http://www.isle-of-man.com/manxnotebook/towns/douglas/lic_1789.htm
Redfern name crops up regularly in Castletown property records