To narrow down searches, you can use hyphens or parenthesis to put a priority on the spelling and word order.
For example: doug-gilmore or "doug gilmore"
The only info I have found so far is a TV show called The Gilmore Brothers (Keith and Doug) which was produced by Telstar.
Interestingly the only info I can find so far is some old trademark information here: http://www.trademarkia.com/the-gilmore-brothers-keith-doug-73076361.html
But maybe that will give you a starting point.