A similar question was asked on a recent 'This Week in Startups' http://thisweekin.com/thisweekin-startups/this-week-in-startups-with-tony-haile-chartbeat/ http

A similar question was asked on a recent 'This Week in Startups' http://thisweekin.com/thisweekin-startups/this-week-in-startups-with-tony-haile-chartbeat/ http://thisweekin.com/thisweekin-startups/this-week-in-start... The gist of the answer was that if you were clearly making a play on the word eBay or if people might get them confused, then you have to stop. It doesn't sound like your case, so you are probably in the right, but the next question is how to deal if you want to fight it or ignore it.