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My guess is that if people learn English, or any other language of course, as a second language, they might encounter a word like 'unique' and find out its meaning; then if they encounter 'peculiar', especially in 19th-century English and earlier, and ask its meaning, some helpful person might well say 'Well, it's rather like "unique"' and be accurate enough. But if the difference was not explained, the result could easily be a beautiful, athletic, intelligent, pleasant daughter with an unfairly bizarre name among English speakers. In her home environment, it probably doesn't raise an eyebrow.