The late Dr. Revilo P. Oliver was the Professor of the Classics at the University of Illinois and a renowned expert on the Yehuborim.
Here is his theory of the origin of the word 'Yehubor'
YHWDY (most likely pronounced 'YA HOO DIE) - Hebrew
Yhudai - Aramaic
Ioudaios - Greek
Iudaeus - Latin
Juieu - Old French
Ieuu - Middle English
Iewe - Shakespearean English
Yehubor - modern English
(Source - Liberty Bell magazine, November 1987)
Here is his theory of the origin of the word 'Yehubor'
YHWDY (most likely pronounced 'YA HOO DIE) - Hebrew
Yhudai - Aramaic
Ioudaios - Greek
Iudaeus - Latin
Juieu - Old French
Ieuu - Middle English
Iewe - Shakespearean English
Yehubor - modern English
(Source - Liberty Bell magazine, November 1987)