Lenkerbeck is in far western Germany. But Ellis Island shows 4 Roman Jankowskis with one born in/from Kalisch/Kalisz,Russia age 5 on 12/22/13 arrival date with Teodor,34; Lucia, 36; and Leon, 11...on SS Pretoria going to Boston. But Lenkerbeck, Recklinghausen kreis/county, Westfalen sounds remote to Kalisz Poland and you do not provide much more info to go on! Check the German white pages for the Recklinghausen area via efon buch.de>. LDS did show some filming in the Recklinghausen Kreis/county towns but not Lenkerbeck! Jankowski is a common Polish surname so you may have your work cut out for you!!!