Welcome back, prodigal daughter. The Greek character that looks like X is pronounced like unto a German ch (of the harder ach variety, not the softer ich variety, if I'm not mistaken). The letter usually transliterated with an x (the upper case version looks like three parallel horizontal lines; the lower case like a backwards numeral 3 with some extra stuff at the top and bottom) is pronounced, in Classical Greek anyway, as a ks and in English pronunciations of the Greek as a z. Xiape, assuming it to be a transliteration and not an attempt to represent Greek letters with a Roman character set, would be pronounced something like ksee-ah-pay in Greek or, probably, zy-uh-pee in English.