KANJI GUIDE
The character in 武士道, the way of the samurai, and in 柔道. Read dō, and the head of it is taken for do.
Both kana for this sound — な and ナ — were made from 奈. And Japan has written foreign names with it for centuries: 加奈陀 is Canada. Yours is in good company.
Half of 瑠璃, the deep blue stone. On its own it is used mostly for its sound and its colour.
To strive at something hard. 努力 is effort — the word Japan uses more than almost any other.