"Kuai Zi" in Engpsh is pronounced as "Quickest".
The origin of the name is not clear. It could be a reference to someone who is quick-witted or fast in decision-making.
Examples:
"He's the quickest person I know when it comes to solving problems."
(他在解决问题方面是我认识的最快的人。)
"She's always the quickest to finish her work, even when compared to others who have more experience."
(即使与拥有更多经验的人相比，她总是最快完成工作的。)