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Worldwide, Rzhen (Rzhen) is an extremely rare unknown gender first name.
Рзген, 儿珍, 尔侦, 尔振, 尔朕, 尔桢, 尔珍, 尔真, 尔臻, 尔蓁, 尔贞, 尔针, 尔镇, and 尔震