birthdates: Geng Yin, Jiashen, Renchen, Jiachen,
Eight-character and Five-element score:
Jin 19.38; Water 2.4; (Score of the same category: 39.78)
Wood 34.98; Fire 3; Soil 1; (Heterogeneous score: 47.98)
Difference: -8.2 Comprehensive prosperity and decline score: -8.2
Eight characters are too weak.
Candidate names:
Wang Chenshan
Wang Qiuming
Wang Chenshou
These are the most professional auspicious names, which are in line with birthdates's naming taboos, and the five elements and five grids are full marks.
Among the Chinese characters suitable for naming, there are hundreds of combinations of auspicious names that meet the five-element balance and five-grid perfect score, and all of them can be calculated to choose the most satisfactory one according to their own wishes. But I don't know your personal preferences, so I can only try my best to choose a few for your reference and open your mind according to the principles that most people like, hoping to help you.