the mariners' hollo! Hallo  is also  German ,  Danish ,  Norwegian ,  Dutch  and  Afrikaans  for Hello. If I fly, Marcius,/Halloo me like a hare.-- Coriolanus  (I.viii.7),  William Shakespeare Webster's dictionary  from 1913 traces the etymology of  holloa  to the Old English  halow  and suggests: "Perhaps from ah + lo; compare