I would estimate that 95% of companies which select a name for their product or as their company name fail to do a comprehensive trademark search prior to selecting a word or combination of words as a brand. Too many companies see that a domain is available for registration and assume that their registration of that domain entitles them to use.
Hiring an attorney to do a trademark availability search is relatively inexpensive compared to the investment which your company will make in its marketing and branding efforts. Having to select a new company name or product name after receipt of a trademark infringement threat letter, will cost you money, time and customers. When it comes to trademark issues, an ounce of prevention really is worth a pound of cure.