Nicknames are common in African societies. In Swati families, the use of nicknames is widespread and almost every member of a family possesses one. The nicknames are given to people in addition to their personal names from a young age until adulthood. This paper aims to explore nicknames bestowed on people within Swati families. This study is qualitative and adopts a socio-onomastic approach. The researchers used participant observation to collect data to gain insight into how nicknames are bestowed on family members and to establish their meanings. A total of 51 nicknames were collected and analysed. It was established that nicknames are given based on the socio-cultural traits of the family and society. It was also ascertained that nicknames are derived from an individual's character, physical appearance, prominent people's names, remarkable events, and short forms of personal names. Some nicknames are meaningful while others are meaningless. They are used as informal identities within the family setting and in the community.