Bitcoin + Finance = Binance, got it.
Ku + Coin = KuCoin, but again, what is a "Ku"? Is that Japanese for Kung Foo?
Kucoin is a Chinese exchange, and maybe "Ku" is a Chinese word. I just search for the meaning of "Ku", it gives the results "warehouse or store house". Seems quite reasonable.

But I don't think Kucoin will be the # 1 choice if Binance is banned in the US. Maybe OKEx or Houbi would be more realistic.