Derived from Old Norse hulda meaning “hiding, secrecy”. This was the name of a sorceress in Norse mythology. As a modern name, it can also derive from archaic Swedish huld meaning “gracious, sweet, lovable” [2].
From Japanese 寛 (hiro) meaning “tolerant, generous”, 裕 (hiro) meaning “abundant” or 浩 (hiro) meaning “prosperous” combined with 子 (ko) meaning “child”. Other kanji combinations are possible.