I asked Google to describe it and it described how I pronounce it:
"Uiua" is pronounced like "oo-ee-oo-ah", with the sounds flowing together. The "u" sound is like in "boo," and the "i" sound is like in "see," while the final "ua" is a combination of the "oo" sound and the "ah" sound.
lenkite|3 months ago
"Uiua" is pronounced like "oo-ee-oo-ah", with the sounds flowing together. The "u" sound is like in "boo," and the "i" sound is like in "see," while the final "ua" is a combination of the "oo" sound and the "ah" sound.