I watch her YouTube and I think she said a while back that they'd picked the name ages ago and said something like "I think it's a Dutch name?" to her boyfriend, so I'll give her the benefit of the doubt that's it's a real name that just translates weirdly. They're building a house in the Netherlands and she also said she can't imagine speaking to the baby in English so it seems like they won't be around too many native English speakers who'll be like "Mint? Ok then "