Here are some possibilities:
* KWAY-see: This pronunciation emphasizes the "qu" sound and uses a long "e" at the end.
* KWA-see: This pronunciation shortens the "e" sound.
* KWAY-see: This pronunciation emphasizes the "qu" sound and uses a long "e" at the end, but with a more open "a" sound.
To determine the correct pronunciation, you need more context:
* Is it a name? If it's a name, you should ask the person how they pronounce it.
* Is it a word from a specific language? If it's a word from another language, you'll need to consult a dictionary or pronunciation guide for that language.
* Is it a made-up word? If it's a made-up word, the creator might have a specific pronunciation in mind.
Without more context, it's impossible to say for sure how to pronounce "Quacey."