エルニーニョの名前の由来 - 英語 - 教えて！goo

とある問題で、どうしても納得できないところがあります。

問題 Why was the current named "el nino"?


The Spanish word "el nino," which means "the child," is also used to refer to Jesus Christ, the child of God. In Peru, the word has acquired yet another important meaning:it refers to the warm ocean current which flows from the equator to the coast of Peru every year at about Christmas time. Recently, because of the impact on the world that this ocean current has had, the word can sometimes be heard on Japanese television.


答え Because the current comes each year at about Christmas time.

私はどうしても、これが名付けられた理由とは思えないのです。
これは暖流のことを説明しているだけで、どうして名付けた理由になっているのでしょうか？ よろしくお願いします。