I want to register trade mark name in our country. We found the same name is registered in Japan only (not in our country). I think we can register the trade mark name in our country. This is because we will use the trade mark name to name specific technology and a specific class. In Japan, the same trade mark name is registered in a different class and used for a product name. What are disadvantages of using same name?
Confusion. Once a brand is established people associate it with the products it sells or services it offers. Also, even if it is legal to register it in your own country, you could very well have problems should you ever want to branch out in the future. It's always best to try to come up with something unique and identifiable.
Complex question. Many factors come into play.
Best solution, use a different brand name. If you're working in a very different industry, likely this won't ever bite you.
That said, I'd suggest you get Legal Shield coverage in your jurisdiction of domicile (where you file your taxes).
They're a legal COOP based in Ada Oklahoma + are available now in many countries.
Here's a real example of how this works.
The last time I was sued (in the US), I paid my $26/month (likely more expensive now) + the person suing me had legal fees of $42,000 for the first month of the suit.
I then called up the person suing me + told them next month, their legal fees would double + I'd keep doubling it every month, they the lost every dime they'd ever made or ever would make.
Since your Legal Shield attorney is working for you, your attorney will know how to wreck havoc on anyone suing you, so likely anyone suing you will go bankrupt as a result.
Summary: You never know when you'll be sued, so get Legal Shield coverage... so... like me... every time you get lawsuit paperwork in the mail, you have to sit down because you're laughing so hard.
I'm a trademark attorney and have experience advising clients on issues such as this. If the name you're interested in using will be connected to different products and services than the mark registered in Japan, there may be very little risk of confusion. You'll likely have different customers/clients and different marketing regions.
Think of the name "Dove." We have "Dove" bar soap and "Dove" chocolate. Same name; however, the products are completely different and are protected in different trademark classes. There is no risk of confusion and the two are able to coexist.
One anticipated risk is the mark could ultimately be diluted (i.e. lose its strength and uniqueness), but that depends on a host of other factors. Please let me know if you have additional questions.