My grandmother was a Yearby and I've been researching the family for several years. I live in England and my Yearby connections all are in England. I seems that the main concentration is in the Leicester area.
I know some have emigrated to various parts of the world and I'm sure there is a link to the American Yearbys somewhere although I haven't found it yet.
I'd be pleased to hear from anyone who knows of any English connections and I would be glad to share any information I have too.