What Did Our Customers Say?
欲音 (Yokune) - Greedy Sound, from the fact that she has two voicebanks (female and male).
However, her name is also a playword on the phrase Yoku Neru ko. Alternatively, her whole name is sometimes written as よく寝る子 (yoku neru ko), which translates as "The girl who sleeps a lot."
Character is error.