Caesium

Caesium was adopted by Isayah. Isayah had gone to wander the Dreamlands in search of a puppy in need of help who'd been reported to him. Isayah himself was adopted from the Dreamlands by his adoptive parents Nova and Alfie, so he decided to continue the legacy and adopt this happy little pup. He named her Caesium, Greek for ''heavenly blue''.

(Player's note: Caesium is one of my favourite chemical elements, but in lore, Isayah is unaware of the existence of chemical elements, hence why he wouldn't have named his adopted daughter as such. But lore is lore, so let's pretend Isayah knows Greek.)