Was Warsaw also known as Warschow
Just a guess But German for warsaw was warschau, If you were stood infront of an officious type with the ability to not give you citizenship, maybee youd let him spell it any way he wanted.
maybee Rachel Grachow was a graschau. Poland probably hasnt got many lists (birth,d,m) as wars would have swallowed em, maybee try German records or jewish.