The search engine does not take account of these widespread variants of English first name.
When I searched "Fleecy Moore" (as it appears on a the booklet), the existing artist "Fleecie Moore" was not shown. Instead of it I see "Jackie Moore", "Thomas Moore", and a lot of names very distant to "Fleecy". So I added this artist mistakenly:
http://musicbrainz.org/edit/16928066
The same thing is for all countless Johnny-Johnnie, Jacky-Jack, etc.
I think, at least "-ie" instead of "-y" at the end of the first name can be considered as close for searching.