Is there an app to read the Palm Doc format (PDB) on iOS? Any recommendations from actual users ? 

The files are non-DRM pdb books that I have on old Toshiba e830 PocketPC.

I am specially interested in software that can handles non English encoding well (Latin2 or Win1252)

Thanks
You can use Calibre on your desktop to convert your PDB books to ePub. See here for the list of supported formats in Calibre.