From a digital marketing and branding perspective though, I generally advise our ecommerce and SaaS clients to never utilize a name that might cause confusion regardless of Country of origin for competitors. We have our own offering coming out in Jan 2015 for a SaaS product and we ditched 2 awesome names because we saw others using names either identical or way too similar that could cause confusion. Better to be unique than have confusion, especially if the idea that you and the other guy have are the same industry or problem solution.
One point though, is that since you own the .com domain people will likely hit your site first even when looking for the other guy as it is so common for people to type .com over any other TLD. But, I still don't like using a name that could be confusing.
The web is global as a whole, and so is branding when dealing with SaaS and web properties.