Actually, when it came to naming the child, before Cheng Su arrived, Father Qi and the others already had a draft in mind. For rural children, it's not unusual to give them humble nicknames, but proper names are quite important, especially for boys. Some families ask fortune tellers and use the Five Elements to find a perfect name.
So once Mother Qi heard about the grandson's birth time, she consulted a master in this field. The child lacks gold in the Five Elements, so it's best to include this element in the name. Then she discussed with Father Qi about giving the name containing 'Gold'.
Father Qi was quite earnest about his grandson, so if a name hadn't been decided yet, he naturally would have discussed with his son whether to include such a character.
But now seeing Cheng Su already mentioned the name, he didn't bring it up to spoil the mood.
