Just because they're different marketplaces doesn't mean something from one can be directly copied (including the name) in the other by someone not affiliated with the original.
Recently, one of our local supermarket chains started a re-branding effort. They have had a "house brand" product line of one name, and one would think that would be the new name for the stores. However, because that name was being used by a different chain in another part of the country (different marketing area) they couldn't use that name to brand the stores so they had to choose a different name.
You don't have to be competing in the same market in order for there to be a copyright or trademark issue.
What makes you think they don't own the name? It's not like Apple said "OK, this will be the name of your app", the developer gives it a name.