@SakuraDrop I don't have access to the raws but it might have been a small う to extend the む sound, so it goes like むぅーと.
Disclaimer: I don't have formal education of Japanese so I don't know whether this is a thing or not, but if the author wants to have a theme with the naming, then I'd say follow what the dragon says, since it's the one "representing the author" here.