You can think of an occupier as whoever is in a place and holding it — standing on the ground, using the rooms, deciding what happens there. The word answers one question only: who is in it now? It says nothing about who the place belongs to, and nothing about whether the person was welcome.
「occupier」可以想成：誰正佔著這個地方、正在用它。字面只回答一個問題——現在是誰在裡面。它不回答「這地方是誰的」，也不回答「這個人是不是被歡迎的」。因為這兩件事都沒被說出來，同一個字才能一邊指信封上的住戶，一邊指開進城裡的軍隊；差別全在旁邊的情境，不在字本身。
From the word’s history
From Middle English occupier, occupiour, from occupien plus -er (that is, occupy plus -er), or from Middle French occupier, occupiour — literally one who occupies.
來自中古英語 occupier、occupiour，由 occupien 加 -er 組成（等於 occupy 加 -er），也對得上中古法文的 occupier。字面就是「佔著的人」，這也解釋了為什麼兩個差很遠的用法會共用一個字。
Wiktionary entry for occupier (kaikki:3f6f69a190036ae4:1292365918), supplied in this packet
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