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I had to research quite a bit but I probably still got a few bits wrong don't flame me
Hitoshi Keshihi (消日) Aizawa
消 (Keshi) – "Erase," "extinguish," "disappear."
日 (Hi) – "Sun," "day," "light."
Meaning vanishing light, as he takes hold of a person's mind with his Quirk, and causes their consciousness to vanish.
*'Keshi' taken from the kanji of Shouta’s name, 'Hi' taken from the sound at the start of Hizashi's name.
Eri Sashita (差太) Aizawa
差 (Sashi) – "Shine," "difference," "extend," or "spread."
太 (Ta) – "Great," "big," "thick," or "grand."
Meaning great power, or something of that caliber. More interpreted to mean her 'large light' (her quirk/horn) brings other people power and great aid.
*'Sashi' taken from the sound at the end of Hizashi's name and 'Ta' taken from the sound at the end of Shouta’s name.