19th-century coinage, which has recently enjoyed some popularity. This is one of the group of names taken from or suggestive of gemstones. The word crystal, denoting high-quality cut glass, is derived from Greek krystallos ‘ice’. As a boy's name, Crystal originated as a Scottish pet form of Christopher, but it is rarely used today.
English: from Middle English more ‘moor’, ‘marsh’, ‘fen’, ‘area of uncultivated land’ (Old English mōr), hence a topographic name for someone who lived in such a place or a habitational name from any of the various places named with this word, as for example Moore in Cheshire or More in Shropshire.