I am tracing my husband's family and his great-grandmother was from Grosscircvitz (Big Circus), Prussia/Germany (Cierkortz or Cierkwitz, Germany), of which I am unable to locate ... I have a feeling none of the above are entirely correct, but this is a translation made by another family member.

Does Grosscircvitz (Big Circus), Prussia/Germany (Cierkortz or Cierkwitz, Germany) sound familiar to anyone? I've tried doing internet searches for all and came up with nothing.

I guess you search Groß Zirkwitz, Province Western Prussia, since 1920 part of Poland (Duza Cerkwica).