马子凯子
[mă zi kăi zi]
This nickname combines the names 'Mazi' and 'Kai'. '马子 (Mazi)' can refer to a girl/lover or slang in some contexts. '凯子 (Kaizi)' might imply a generous, easygoing friend. Together it may denote specific people dear to the individual, perhaps referring to friends or lovers with these names, but it can also hint at more complex personal meanings unknown outside the context.