One way to hold this word: start with the animal standing on a cold mountain in its thick coat. Everything else the word means is that coat at a later stage — first cut off the animal, then woven into cloth. The name simply travels with the material and never changes.
可以想成從那隻動物開始：牠站在寒冷的高山上，身上一件厚厚的毛衣。這個字的其他意思，都是同一件毛衣的後續——先從動物身上剪下來，再織成布。名字就這樣跟著材料一路走，中間沒有換過。
From the word’s history
Borrowed from Spanish alpaca, from Aymara allpaqa, a language of the Andes — the word travelled into English with the animal itself.
英文的 alpaca 是從西班牙文 alpaca 借來的，而西班牙文又來自安地斯山區的艾馬拉語 allpaqa。也就是說，這個字是跟著這種動物一起從南美洲進到英文裡的，所以動物才是這個字的起點，毛和布都是後來接上去的。
Wiktionary, "alpaca"
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