User blog comment:HazelQuill7445/Awesome fan art/@comment-25936766-20170802031605/@comment-26397825-20170802033032

It's not 'he's a bird so any white bird will do'. It's two separate elements mashed together. Snow for her last name + bird for his first name and what he turns into. She's got nothing bird-like about her, so a pure bird name simply doesn't work for the theming.

Plus, I think the crew referred to them as Snowbird in reference to how they used Freebird as the stand-in fight scene music when they were animating it and before they put the actual fight theme in.