The issue there is that she loved Moana. He thought she would get bullied for that name, so instead named her after a bug. He put his love for insects over his wife's love, and tried to rationalize it to himself. But his rationalization doesn't hold under the least bit of scrutiny, because more kids would tease her after being named after an insect than a Disney movie. The saving grace here is that the cicada doesn't come up in Urban Dictionary (kids love that shit), and it comes up after the Brazilian municipality.

Overall, I'd say he is the butt head, but it's not a huge deal.