Interestingly, that is not the case. Month names can differ in different languages. I discovered the hard way that Ukrainian has completely different names for months when I had to connect to a Linux machine in Kyiv with Ukrainian locale (I can read Cyrillic, but the abbreviated month names meant nothing to me). The name for August is "serpen" by the way, and it is similar in some other Slavic languages. Also Arabic has its own month names based on Akkadian, August is "ab" but an Arabized version of the word August is also commonly used and understood. Finally, in Mandarin and presumably other Chinese languages, Gregorian months are only referred to by their number, so we are in "bayue" (lit. eight(th) month).