Since all your families use these names, I'll help you think of a few more: Zhang Zhenxiao, Zhang Zhenze, Zhang Zhenhao, Zhang Zhenbei, Zhang Zhenyuan, Zhang Zhenhan, Zhang Zhenhao, Zhang Zhenbin, Zhang Zhenhan, Zhang Zhenlin (the word Lin is the prefix of rain and water), Zhang Zhenyu, Zhang Zhenlin and Zhang Zhenyi. I like it better: Zhang Zhenxiao, Zhang Zhenze, Zhang Zhenhan and Zhang Zhenhan.