Nice try all of you! Seriously, being Brazilian I also don't know what Reiza means (while it sounds good to our ears). Oh and we here pronounce Reiza as Rei+za = Hey + za (Z as in the letter name + "a" as in car) Reiza could be an acronym as someone stated or a foreigner surname. Maybe the new Reiza site will clarify? Or just asking Renato Simioni (as long as I know, a Italian surname)
Rezar is also the 3rd person singular present composition of the verb xD But you are right, reza is not the infinitive form