Nan
来自Big Physics
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1940s: abbreviation of nanny, or a child's pronunciation of gran.
wiktionary
From Nan, pet form of the formerly very common female given names Anne and Agnes. As a nursemaid and grandmother, a clipping of earlier nana, from nanny under the probable influence of mama, also from Nan. Compare Mary.
See at naan.
etymonline
Nan
fem. proper name, usually a familiar form of Ann before the 20c. rise in popularity of Nancy. From c. 1700 as a characteristic name for a serving maid. As short for nanny, etc., from 1940.
