Chinese (pinyin): precious or treasure, but also a term of endearment like "baby" or "love"; also synonymous with SiSi.
Literally from "bao" meaning to cover or wrap or a bag or bundle and "bei" meaning "shell" (I guess).
Other fun words related to "bao" include:
baozi - Chinese buns (my favorite thing to eat!),
literally meaning "bun bread"
baobao - baby, or infant,
literally "womb bun"