Quick definitions from WordNet (crest)

▸ noun:  a showy growth of e.g. feathers or skin on the head of a bird or other animal
▸ noun:  (heraldry) in medieval times, an emblem used to decorate a helmet
▸ noun:  the top line of a hill, mountain, or wave
▸ noun:  the center of a cambered road
▸ noun:  the top point of a mountain or hill
▸ verb:  reach a high point ("The river crested last night")
▸ verb:  lie at the top of
▸ name:  A surname (very rare: popularity rank in the U.S.: #47837)

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▸ Also see crest