Aleksander can be Sender. But I have seen Eli listed as Alex in a number of records. Eli was short for Eliya or Elias. possibly Eliahu in hebrew. 
--
Raina Accardi 
Saugerties, NY
RAgenealogy@...
Poland: GEVIRTZMAN in Kobylin; JESINOWITZ/YESNOWITZ in Mszczonów; FELSENSTEIN in Parysów.
Belarus: GUTTWOCH/GOODMAN and ZISSERMAN in Volchin; BUSHMITZ in Vysokaye.
Ukraine: TRAUB and JANOVSKY in Kolki, Sofievka, Radomysl, and Zhytomyr; WEISMAN or ROSENBERG.