sentences:  The name "Collie" is thought to come from the Scots word for "black" or "coal" (coll) and may have referred to a type of sheep (Coaley) which they were once used to herd.However, "Collie" might also have come from the Gaelic "càilean" and "cóilean" for "dog" or "young pup", or from the Celtic word for "useful" which is "collie".Due to its popularity, it was imported to other countries including the U.S., where it simply became known as the Scotch Collie.