Of course Salomea has Hebrew origins (and in this sense it's not a "Polish name"), but is used in Poland in this exact spelling. It's not the sole case of the -ea ending in Polish female names - another Biblical name, Leah, is spelled Lea (LEH-ah), and recently Andrea was approved by the Council of the Polish Language as well. BTW, the patron saint for this name, Blessed Salomea, was a Polish princess from the 13th century.