Does guillotine count as a loanword when it’s actually named after someone? That’s like saying pasteurise is a loanword because Louis Pasteur was French, even though the word is clearly just his name
Fun fact about the guillotine, it’s not named after the person who ‘invented’ it (there were other iterations outside of France). Or well, it was briefly, it was called the louisette after Antoine Louis, but the guy named Guillotin was just the person who proposed using it as a more humane way to carry out the death penalty instead of the more brutal breaking wheel at the very beginning of the French Revolution.
While I’d say no in English, the word is at least a loan word in Spanish