一: To signify the beginning, to embody the entirety, and to represent the pinnacle of excellence and perfection.
森: Flourishing, prosperous. The meaning of flourishing, when used in a person's name, aids in the vitality and vigor of life. It is a character that embodies happiness and nobility.
Meaning: One, represents uniqueness and purity; Sen, represents lushness and vitality. It implies being unique and full of life.