The Heavenly Stem in the name refers to the Heavenly Stem on the day when King Shang was born.
Later added to the name.
For example: Gaozong Wu Dingzhao. Gaozong is his temple name. Wu is his posthumous name. Ding, it’s my birthday. Zhao, is his name.
Wai Ren wins. Outside, it is a posthumous title. Ren, it’s Tiangan’s birthday. Victory is a name.