Picture a small girl with golden hair standing in a kitchen that is not hers. Three bowls of porridge are on the table. One is too hot, one is too cold, and the third one is just right. Everything this word does comes back to that girl and that third bowl. The hair gives us a playful name for a blond child. The third bowl gives us a way to say that something sits exactly between too much and too little.
The name itself seems to be gold plus locks, an old word for a tuft or curl of hair — so the name reads as 'golden hair', which is the girl the story draws.
這個名字看起來是 gold（金色）加上 locks 組成的。locks 是舊一點的用法，指「一綹頭髮、捲髮」。所以名字字面上就是「一頭金髮」，正好就是故事裡畫出來的那個女孩。來源說法本身帶著「apparently（看來是）」的保留語氣，不是百分之百確定。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:2210689635:12690), entry Goldilocks: "Apparently from goldilocks, equivalent to goldy + locks (tuft of hair, curl)."
Two branches
那個金髮女孩，以及金髮的人
這一支就是核心畫面本身。先是故事裡那個金髮女孩，然後是拿她的名字去叫真實生活中金髮的人。兩個意思共用的是「一頭金色的頭髮」這個看得見的特徵。
noun · B2
The girl in the children's story Goldilocks and the Three Bears. She has golden hair, and she walks into the bears' house while they are out and tries all three of their chairs, bowls of porridge and beds.
金髮女孩（童話角色）
剛剛好，不多也不少
這一支借的不是頭髮，是那第三碗粥。故事裡她每樣東西都試三個，前兩個一個太過、一個不夠，第三個剛好。英文把「第三個」那個位置抽出來當形容詞用。
adjective · C1
Exactly right, because it is neither too much nor too little. It goes in front of a noun, and it is used for conditions, levels, amounts or places that sit in the perfect middle between two extremes — as in the Goldilocks zone, the band around a star where a planet is not too hot and not too cold for life.
恰到好處的