Yes, let us know which titles were requested. I work with a lot of nationalist Jewish music that uses Jewish folk melodies, so I might know of some that include the tunes you want.
In the meantime, take a look at my webpage, which includes some of this Jewish classical music based on Jewish folk melodies -- if you only want the melodies, you could look at non-piano music:http://idisk.mac.com/samzerin-Public/jewish-music/index.html
Of the scores on that site, some very popular Yiddish tunes are "Di mezinke oysgegebn" (Petersburg #29), "Hebreyishe viglid" (Petersburg #39), "El Yibneh Hagalil" (Petersburg #43), "Lomir zikh iberbetn" (Petersburg #48), and "A tantsimprovization" (Petersburg #59).
Here's a fantastic setting of "Hava Nagila", by the symbolist composer Alexander Krein -- Wedding March (from the incidental music to "On the Penance Chain")
You might want to take a look at Engel's "50 Children's Songs": 50 Children's Songs
Also, there are some great piano miniatures by Jacob Weinberg: Folksongs from Jewish Life
And Joel Engel: 10 Jewish Folk Songs, for solo piano 5 Piano Pieces, Op. 19
I have tons more on my computer -- let me know what titles you need and I'll see if I can help.