The five elements of the surname should also be considered.
If using "earth" is not harmful or beneficial to the soul, you might as well consider the combination of "fire, earth, and gold". Fire produces earth and soil produces metal, so there will be no conflict.
If using "earth" is harmful, then you have to use "fire, metal, and gold", so that metal can have the strength to cope with the conflict of fire and cooperate with the needs of the soul.