精神力 /sei shin ryo ku/ meas 'strength of will, willpower' as a noun. 意志堅固 /i shi ken gou/ means 'strong-willed, determined' as an adjective. If you are referring to the Naruto anime term 'hi no ishi' it is 火の意志 and means 'will/determination of fire'.
As a name an example could be 高意 /ta ka o ki/ meaning 'high-willed, strong-hearted'.
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'Strongest' in Japanese translates to 一番強ㄠ(ichiban tsuyoi).
For example: "I am the strongest person in the world" translates to 俺ã¯ä¸–界ã§ä¸€ç•ªå¼·ã„人ãªã‚“ã (ore wa sekai de ichiban tsuyoi hito nanda).