Yukiko = In Japanese, "yuki" means snow and "ko" means child. So, her name is literally, "Snow Child." It fits with her winter birth month and with her snow white hair that she has at some point during the series for reasons I won't be revealing here. I'm not giving out too many spoilers. Lol
Ren = In Japanese, "Ren" is often written with the kanji for "lotus." The meaning of lotus flowers, according to this website = "Meaning varies from culture to culture. In general, however, the lotus commonly serves as a sacred for purity, rebirth, and strength. Because lotuses rise from the mud without stains, they are often viewed as a symbol of purity. Since they return to the murky water each evening and open their blooms at the break of day, lotus flowers are also symbols of strength, resilience, and rebirth. Still another lotus flower meaning is transcendence: the lotus represents the transcending of manâs spirit over worldly matter since it blooms from the underworld into the light." It is well suited for my pure-hearted Ren, whose strength and resilience despite adversity will be seen in the near future when his background comes to light.
