Tu'i, also spelled more simplistically Tui, is a Polynesian traditional title for tribal chiefs or princes. In translations, the highest such positions are often rendered as "king". For details, see the links below various polities.
Wallis and Futuna 
On `Uvea (Wallis Island), there is only the Tui `Uvea or Hau (translated by the French as king/queen; from 1858 also styled Lavelua¹).
Sources and references 
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