To add to that the wikipedia page claims : "In Japanese, atari (当たり, あたり, or アタリ) is the nominalized form of ataru (当たる, あたる, or アタル) (verb), meaning "to hit the target" or "to receive something fortuitously". The word 'atari' is used in Japanese when a prediction comes true or when someone wins a lottery."

https://en.wikipedia.org/wiki/List_of_Go_terms#Atari