Beider's explanation for PORGES :
Jewish women from Prague used numerous hypocoristic forms as given names.
Unlike the case with masculine given names, shortened forms were quite rare, although forms with diminutive suffixes were very common.
Some surmanes coincide with feminine given names :
PURYE (Buria)1573 : Hypocoristic form of Biblical Zipporah (Exodus 2:16)
[Metronymic form : PORJES (Porias, Paris, PORGES, Borges, Borgis)]
In old German sources, the letter G was sometimes used instead of J
(pronounced as english Y after the voyels)
The Purje name is mentioned in B. Bondy-F. Dvorsky "K Historii zidu v Cechach, na Morave a v slensku (906 az 1620)" Prague 1906. (1:362)
Origin of Porges
Porges family in Prague is registered until half of the 17th century as “Purja-Pfefferkorn (on the tombstones) and from the end of 17th century with altered female version of the name “Porit”. This name was preserved in the non-Jewish and non-Hebrew sources given the influence of German pronunciation in the form of “Porges or Porjes, Pories, Porias, Purges, Borges, Borgis, Burges, etc. and remained in this form till today.
....Many Jewish families in Czech lands have traditions of Spanish or Italian descent. Even families like Pollak or Lasch. One of quite typical Jewish surnames was Bondy, which is Bongiorno/Yom tov, in addition to Porges, there have been many Borges.
In Spain Porges/Porjes original name was Borges/Borjes.
Go to www.sephardim.com and search Borges/Borjes.
Borges the great Argentine writer said he was a jewish descendant himself. That's why he wrote the Poem Aleph.