Hm not sure if you guys got official sources for the names, but I suggest you switch Schtren for Stern. The names looks like they are german with a bit french in it (the de between sur and lastname) and in modern german spelling, there basicly exists no word with scht, they are all written as st (despite being pronounced scht). Addionally Stern means star while Stren means nothing. This would additionally strengthen the contrast between the fl's and ml's "starting postion" (female lead: Garten= garden, a cozy, warm place where she doesn't has to care about wordly problems. male lead: Stern= star, a cold, desolate place, far away from civilization (society)).