金夏沙 is the Taiwan-standard transliteration. Mainland sources usually write 金沙萨 (Jīnshàsà) for the same city.
history
Known as Léopoldville (利奥波德维尔 Lì'àobōdéwéi'ěr) until 1966, when President Mobutu renamed it as part of his Africanization (zhèngmíng-yùndòng, name-rectification) campaign.