這個拼法是2個不同的字· 2 words spelled “caddy”
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, "caddy" (etymology 1)
One branch
球場上替球員背桿、給建議的人
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golf caddie · noun
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
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, "caddy"
One branch
有蓋子、分格的小容器
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tea caddy · noun
A small box or tin with a lid, used for keeping tea leaves dry and fresh.
茶葉罐