> いくつ知ってた？
> http://en.wikipedia.org/wiki/Japanese_words_from_Portuguese

Since Japanese has many loanwords from Portuguese, 
it is often discussed whether the Japanese word arigatō derives from the Portuguese obrigado. The Japanese phrase arigatō is a shortened 
form of arigatō gozaimasu, meaning "Thank you". 
This is a form of an adjective, arigatai, for which written records 
dating back to the Manyoshu, well before Japanese contact with Portugal, exist.


これはさすがに違うだろ(;´Д`)

参考：2006/01/29(日)21時47分36秒