Globally, Petra Johanna (Petra Johanna 
) is a very rare female first name. The given name Petra Johanna is habitual in Western Europe, particularly Germany, where it is a very rare feminine name.
| VARIANT | COUNTRY |
|---|---|
| Petra Johanna | Germany, Sweden, Spain, Finland, Ecuador |
Unser, Kaffke, Seppaelae, Kutz-Breimer, Laakkonen, and Schoellhorn