The crossword solution for the term NO. 1 SON OR HIS POP is CHAN, a four letter word. Chan is a Chinese surname that is derived from the Chinese character 禪, which means 'ZEN' or 'MEDITATION'. It is also a common Korean surname, and is sometimes spelled as 'Chun'. The term NO. 1 SON OR HIS POP is a reference to the traditional Chinese concept of filial piety, which emphasizes respect for one's parents and ancestors.