A nickname is "a familiar or humorous name given to a person or thing instead of or as well as the real name.
"[1] A nickname is often considered desirable, symbolising a form of acceptance, but can sometimes be a form of ridicule.
A moniker also means a nickname or personal name.
The word often distinguishes personal names from nicknames that became proper names out of former nicknames.
English examples are Bob and Rob, nickname variants for Robert.