Choo
Choo is a term that can refer to a surname or given-name element in East Asian contexts and to an English onomatopoeia for the sound of a locomotive. As a surname, it is often a transliteration of the Korean family name 주, though it may also be encountered in other transliteration variants such as Ju, Chu, or Ju. In English-speaking contexts, individuals with the surname Choo appear in a variety of professions and fields.
Notable people with the surname Choo include Shin-Soo Choo (born 1982), a Korean-American professional baseball outfielder
In popular culture and language, Choo also functions as an onomatopoeia representing the chuffing or whistle