Kai 1mFrisian, German, Danish, Norwegian, Swedish, Finnish, Dutch, English Meaning uncertain, possibly a Frisian diminutive of Gerhard, Nicolaas, Cornelis or Gaius. It is borne by a boy captured by the Snow Queen in an 1844 fairy tale by Hans Christian Andersen. Spreading from Germany and Scandinavia, this name became popular in the English-speaking world and other places in Western Europe around the end of the 20th century.