這個拼法底下其實是2個不同的字，意思沒有關係， 只是長得一樣。下面分開列出來。跳到 桿弟；球童 · 茶葉罐
Picture the person walking beside a with the whole bag of clubs on one shoulder. They are there for the player, all the way round: handing over the club that fits the shot, looking at the slope, keeping an eye on where the ball went. So this caddy is a role someone takes for a game, not a thing you own.
The evidence records only that caddy here is a variant spelling of caddie. Nothing further about where caddie itself came from is in the evidence, so nothing further is claimed.
資料只記到一件事：這個 caddy 是 caddie 的另一種拼法。至於 caddie 本身更早的來源，資料裡沒有，所以這裡也不多說。
Wiktionary (kaikki dump, source_ref kaikki:3f6f69a190036ae4:613604004:4471 and :613608475:4771), etymology_text: “A variant of caddie (etymology 1).”
One branch
球場上替球員背桿、給建議的人
這一群就是核心畫面本身，一個當名詞看那個人，一個當動詞看那件事。
noun · B2
A person who carries the clubs for someone playing golf, and who often helps that player choose a club or read the ground. The usual spelling is caddie; caddy is another spelling of the same word.
桿弟；球童
A second word, same spelling
Picture a small box with a lid that you can lift in one hand. Things that would otherwise be loose live inside it, shut away from the air or sorted into their own little spaces, and you can pick the whole thing up and put it where you need it. That is the caddy: a container that keeps a set of things together and ready.
The evidence gives this caddy as an alteration of catty, a unit of weight used in China of about one and a third pounds, borrowed through Malay kati from Tamil. That is a weight, not a box, so the step from the amount of tea to the tin that held it is a reasonable way to see it rather than something the evidence states.
資料記載這個 caddy 來自 catty，一個中國用的重量單位，大約一斤多一點，經由馬來語 kati 借自坦米爾語。那是重量，不是盒子。所以從「一斤茶」走到「裝茶的罐子」這一步，是一個合理的理解方式，資料本身並沒有這樣寫。
Wiktionary (kaikki dump, source_ref kaikki:3f6f69a190036ae4:613594425:9579): “An alteration of catty … borrowed from Malay kati … from Tamil கட்டி.”
From the picture
有蓋子、分格的小容器
這一群共用同一個容器的畫面，差別只在裡面裝什麼，以及重點是「密封」還是「分格好拿」。
noun · C1
A small box or tin with a lid, used for keeping tea leaves dry and fresh.
茶葉罐
noun · B2
A small box, tray or stand, often with separate spaces inside, that holds a set of things together and makes them easy to reach or to carry — for example a shower caddy for soap and shampoo, or a desk caddy for pens.
收納盒；置物架