Miriam Bulwar David-Hay
The YIVO Encyclopedia online has an excellent article on Jewish personal and family names in Eastern Europe:
JewishGen too has a number of info files on names:
The ANU Museum in Israel (formerly Beit Hatfutsot) has a long article about Jewish family names and a database into which you can enter names and see information about them:
And of course there are Dr. Alexander Beider’s comprehensive books on names in various regions, which are not online but which you could perhaps find in a library or for sale.
The above sources should answer most if not all of your questions.
All the best,
Miriam Bulwar David-Hay,
Professional journalist, writer, editor, proofreader.
Professional translator (Hebrew/Yiddish to English).
Certified guide, Yad Vashem Holocaust Memorial and Museum.
Researching: BULWA/BULWAR (Rawa Mazowiecka, Lodz, Paris); FRENKIEL/FRENKEL, FERLIPTER/VERLIEBTER (Belz); KALUSZYNER, KUSMIERSKI, KASZKIET, KUZKA, JABLONKA, RZETELNY, WROBEL (Kaluszyn, Lodz); KRYSKA/KRYSZKA, CHABIELSKI/HABELSKI (Sieradz, Lodz); LICHTENSZTAJN (Kiernozia, Wyszogrod, Lodz); ROZENBERG (Przedborz, Lodz); WAKS (Nowe Miasto nad Pilica, Lodz); PELCMAN, STORCZ (Rawa Mazowiecka); SOBEL (Paris); SAPIR/SZAFIR (Wyszogrod).