They didn't skip Eta, which is a common enough name if Xi is, especially given that Xi is pronounced ksʌɪ and, if we're focusing on Chinese (does it exist as a

They didn't skip Eta, which is a common enough name if Xi is, especially given that Xi is pronounced ksʌɪ and, if we're focusing on Chinese (does it exist as a name elsewhere?) it's not going to be romanised and a child in grade school won't be aware anyway.