:There are some taxonomic attestations for [http://www.google.com/search?tbm=bks&hl=en&q=punjabica#hl=en&q=panjabicus&tbm=bks panjabicus] and also [http://www.google.com/search?tbm=bks&hl=en&q=punjabica#hl=en&q=penjabicus&tbm=bks penjabicus], though the most are for [http://www.google.com/search?tbm=bks&hl=en&q=punjabica#hl=en&q=punjabicus&tbm=bks punjabicus], doubtless because of English influence. I agree that if it has a Latin ending, we might as well stick with our "i, not j" convention. But using ''g'' is also an option: Hofmann calls the region [http://www.uni-mannheim.de/mateo/camenaref/hofmann/hof3/s0649a.html Pengabum] (also [http://www.uni-mannheim.de/mateo/camenaref/hofmann/hof2/s0735b.html Lahoria]). And here's a source for [http://books.google.com/books?id=L3ZYAAAAcAAJ&pg=PA609 Pengabensis ditio]. [[Usor:Lesgles|Lesgles]] ([[Disputatio Usoris:Lesgles|disputatio]]) 21:22, 15 Aprilis 2014 (UTC)
::Does [http://books.google.com/books?id=fw8YAAAAYAAJ&pg=PA604&lpg=PA604&dq=quinque+flumina+india&source=bl&ots=qJgKJIRXAT&sig=L7GhQ2K2PnBksB5YWPgCbmYN4WU&hl=en&sa=X&ei=LqZNU4ikAePQsQTpqYH4BA&ved=0CCoQ6AEwAQ#v=onepage&q=quinque%20flumina%20india&f=false ''Panjábi''] imply a nominative ''Panjabu(m,s)''? In any case (sic!), it would seem to support ''lingua Panjabica.'' [[Usor:IacobusAmor|IacobusAmor]] ([[Disputatio Usoris:IacobusAmor|disputatio]]) 21:42, 15 Aprilis 2014 (UTC)
:::I can't access that page, but I think the answer is that unluckily it doesn't imply such a nominative: it is probably a feminine nominative singular itself.