As is the name Udink. Even though it really belongs to some folks as a last name, and several of them had plates with variants on it, Oregon has now pulled all the plates, because I guess as a noun, dink has some kind of sexual meaning, and as a noun, it can be a bad slang reference to a Vietnamese person. Read more about this story here.
I always thought it was weird that there were people who sat around all day trying to figure out if your plate said something dirty in Portuguese. I’ve even met a verfier. She came to a signing one time and gave me a treasure-trove: her list of favorite plates that she had collected over the years. It was a treasure trove because I was in the middle of writing a mystery series featuring a vanity-plate verifier. The first in the series was Circles of Confusion.