Theres no particuler meaning in it. Most the martial arts (Kendou, Judou, Kyudou etc) as they have the word dou 道 at the end which represents the road. So Kendou =way of sword, Judou= way of softness? Kyudou= way of bow.
Arigatou just have a u at the end. Theres alot of words which doesn't end with a u so there isn't any meaning or rules.
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