For most of the world almost every piece of software has name in foreign language. It's all just sounds, with no meaning other than "the program with icon looking like ...". For people in Poland Windows and Word means computer programs, their real meanings are second thoughts, even if they even know what that words means.

I'll agree - Libre Office sounds strange, but it is adventage - it makes brand stronger. And people will get used to it, if it will be good.

The trick is to insert a glottal stop between Libre and Office.