I've been pronouncing Yse as "Yee-say" or "Yi-say" and Maise as "Maze," for those curios. Although, now that I think about it, I think I've been pronouncing her name as such because I subconsciously thought of Maize when I first saw her name, and when I found out her last name was Hazelnut I just assumed her parents intentionally named her after a food product to match their family name.