90% of people who say they'll get a lawyer involved never do (the kind of people who get lawyers involved, start with a letter from their lawyer).
That's not to say you don't need to change your name/logo, if it really is confusingly similar to someone else in the same industry (if they're not in the same industry, trademark doesn't apply). If there is a problem there, you'd want to remedy it. But, trademarks are pretty specific. If the guy is claiming a trademark on a generic word, you can probably safely ignore him (i.e. if I claim "Joe's Soda", and someone else makes "Sam's Soda", I don't have a case against them...but if someone made "Joe's Cola" I probably would). Also, if you both do business regionally rather than nationally, and he is not in your region, he probably doesn't have a case (though if he has a USPTO trademark and has more than one ___location, he might, anyway).
As you've learned, it's much better to figure this stuff out before you invest in printing and logos and such.
That's not to say you don't need to change your name/logo, if it really is confusingly similar to someone else in the same industry (if they're not in the same industry, trademark doesn't apply). If there is a problem there, you'd want to remedy it. But, trademarks are pretty specific. If the guy is claiming a trademark on a generic word, you can probably safely ignore him (i.e. if I claim "Joe's Soda", and someone else makes "Sam's Soda", I don't have a case against them...but if someone made "Joe's Cola" I probably would). Also, if you both do business regionally rather than nationally, and he is not in your region, he probably doesn't have a case (though if he has a USPTO trademark and has more than one ___location, he might, anyway).
As you've learned, it's much better to figure this stuff out before you invest in printing and logos and such.