Staszek
Stanislav or Stanislaus (Latinized form) is a very old Slavic origin given name, meaning someone who achieves glory or fame. It is common in the Slavic countries of Central and South Eastern Europe. The name has spread to many non-Slavic languages as well, such as French (Stanislas), German and others.
The feminine form is Stanislava
The English name Stanley is popularly regarded as--and often thought to be--the Anglified form. But this is historically and linguistically inaccurate; the two names have entirely different origins and meanings.