If the names are similar and they are in the same industry/sector -- so that the typical consumer might confuse them -- then yes that absolutely can and does ge

If the names are similar and they are in the same industry/sector -- so that the typical consumer might confuse them -- then yes that absolutely can and does get attacked as a trademark infringement. See Facebook versus Teachbook cough I mean Teachquest. Or Microsoft versus Lindows cough I mean Linspire.