Whatsapp can be an extremely confusing name for non-native English speakers. I'm from Spain and I think 90% of the time I see it written in Spain, it's written wrong (wassap, whasapp, wuatsapp, whatsap, watsap, wuassap, wuassapp, whatsup, watsup, etc.). Sometimes a phonetically "transliterated" version is used instead, like "guasap", which I find more tolerable because at least then it becomes a genuine Spanish word, rather than a botched attempt at writing an English word.
Also, many people don't get the meaning/pun in the name at all (which probably is one of the reasons for writing it wrong). Even to me, with a good English level, it wasn't immediate because "what's up" is a very idiomatic greeting and not one that non-natives (or at least, Spanish people) tend to use in a natural way. It took some time to click in my mind.
That said, Whatsapp absolutely dominates chat apps in Spain... so I guess these issues are not that important after all. Or at least, not if you are at the right place at the right time.
Also, many people don't get the meaning/pun in the name at all (which probably is one of the reasons for writing it wrong). Even to me, with a good English level, it wasn't immediate because "what's up" is a very idiomatic greeting and not one that non-natives (or at least, Spanish people) tend to use in a natural way. It took some time to click in my mind.
That said, Whatsapp absolutely dominates chat apps in Spain... so I guess these issues are not that important after all. Or at least, not if you are at the right place at the right time.