masc. personal name, attested in England by late 11c., from Old French Geuffroi, from Medieval Latin Gaufridus, from Old High German gewi "district" (German Gau; see gau) + fridu "peace" (from Proto-Germanic *frithu- "peace," from suffixed form of PIE root *pri- "to love").
shortened or familiar form of masc. proper name Jeffrey; in early to mid-20c., sometimes used by African-Americans to indicate a Southern rural poor white person, probably from Jeff Davis, president of the Confederate States of America.
<a href="https://www.etymonline.com/word/Jeffrey">Etymology of Jeffrey by etymonline</a>
Harper, D. (n.d.). Etymology of Jeffrey. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/Jeffrey