You can think of marchioness as one title with a woman standing in it. The title is a fixed thing, like a seat with a name on it: the Marchioness of somewhere. What changes from case to case is only how the woman came to be sitting there. Usually she married into it. Sometimes it passed to her and it was always hers. And once, in old stories, someone put a girl who scrubbed floors in that grand-sounding seat as a joke.
From the word’s history
The supplied Wiktionary entry derives marchioness from Medieval Latin marchionissa, the feminine of marchion, from Late Latin marca, from Frankish markon and Germanic marko, meaning an area, edge or border. So the title can be pictured as starting from land at the border, and the woman's form of the word is built on the man's by adding a feminine ending.
資料裡的 Wiktionary 條目說 marchioness 來自中世紀拉丁文 marchionissa，是 marchion 的陰性形；再往前是晚期拉丁文 marca，源自法蘭克語 markōn、日耳曼語 markō，意思是「地界、邊緣、邊境」。可以想成：這個爵位的起點是邊境上的一塊地，而女性形式是在男性字的後面加上陰性字尾造出來的。
Wiktionary, "marchioness"
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