The usual situations we get into is that people at the beginning can't remember which one has which name. Luckily, often it is also not important hehe :D.
The worst situation we had so far was probably when we were applying for our first year of uni - our applications looked so similar that they thought it was the same application sent twice by mistake, so they took into account only one of the applications! Luckily we realized on time that something is wrong and were able to appeal :D.