My great grandpa's name was Esker. Other than grandchildren being named Esker, I've never heard it before. Years ago, after he had been long dead, I was reading in a book on geology and it mentioned the word "esker" and I came to learn it is a geological formation. Very fitting, as in my grandpa's day he and one of the worlds largest collection of rocks and minerals, if not the largest. Many pieces of which are in the Rice Northwest Museum of Rocks and Minerals in Hillsboro, Oregon.