From what I was told you can't use a similar name on a similar product or company, but if it's different enough it's ok.
A friend had a few stores selling clothes with a name that was french for something I've forgotten.
Then a large chain started selling and heavily marketing a perfume with the same name. My friend wanted to stop them using the name, but after a few rounds of lawyers he got nowhere because selling clothes and selling a perfume are not overlapping businesses.
Also from what I've understood if you got a trademark, you have to defend it or else risk losing it. So while it often looks like a dick move, they're kinda forced.
A friend had a few stores selling clothes with a name that was french for something I've forgotten.
Then a large chain started selling and heavily marketing a perfume with the same name. My friend wanted to stop them using the name, but after a few rounds of lawyers he got nowhere because selling clothes and selling a perfume are not overlapping businesses.
Also from what I've understood if you got a trademark, you have to defend it or else risk losing it. So while it often looks like a dick move, they're kinda forced.