This is the 515th most frequent Korean word.
최
"최" is a Korean family name meaning "best" or "most" in some contexts.
Here, '최' is part of the word '최선', meaning 'best', used to convey the utmost effort.
최선을 다하겠습니다.
I will do my best.
In this example, '최' is used in '최상급', indicating the highest grade or level.
이 식당은 지역에서 최상급으로 평가받습니다.
This restaurant is rated as top-class in the area.
In this sentence, '최' is used as a prefix meaning 'most' or 'best', forming the word '최연소', meaning 'the youngest'.