杜: Du Kang, Du Fu. The character "Du" refers to the sweet pear tree, as stated in the "Shuowen Jiezi" dictionary: "The male is called 'Tang', and the female is called 'Du'."

坤: Qian and Kun, with Qian representing heaven and Kun symbolizing earth, embody the essence of all things in the universe. When used in personal names, they reflect an individual's lofty aspirations and dreams.