(1) Key points: ① single-character, double-character. ②Generally have gender characteristics. ③There are popular ones and elegant ones. ④Having regional characteristics. (Just write two points)

(2) Key points: ① straightforward ② implicit ③ commemorative ④ related to customs.

(3) Example 1: Hongyi, selected from the phrase "A scholar cannot be without Hongyi, the responsibilities are heavy and the road is long" in "The Analects of Confucius", which means strong, courageous (generous, perseverance), embodying parents expectations - establish lofty ideals and have firm beliefs. Example 2: Zhao Di, a clever use of homophones, hopes to attract a younger brother, both male and female, and have a harmonious and happy family life.