I have a friend who studied at the University in Linz, way back when. According to him, on the Universities System/370 they used to have an account name scheme where they simply concatenated the first 2 letters of the first name and the first 3 letters of the last name. Aledgedly, the scheme got changed after Professor Arno Schulz (https://de.wikipedia.org/wiki/Arno_Schulz) was understandably upset about his account name (https://en.wiktionary.org/wiki/Arsch).