Literature Reference: One who speaks with certainty must be trustworthy. Source from 'The Analects'.
定: Peaceful and serene. In names, it often conveys the meaning of happiness, health, and carefree contentment.
言: Speech, language. When used in personal names, this character often signifies excellent communication skills and a cheerful disposition, which are advantageous for social connections and also denote talent.
Meaning: Speaking with certainty signifies stability and reliability.