原It is much more probable that it's a nickname of names beginning with the word rad such as Radoslav, Radivoje etc. In Serbian letter,,d" before,,k" changes to,,t". Hence why it's not from rat meaning war but rad meaning happy, glad. Ratka is the female version.
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译 这是更可能的是,它是一个绰号名字开始与单词rad如Radoslav,Radivoje等在塞尔维亚字母,d“前,k”变为,, t“。因此,为什么它不是从老鼠意味战争但rad意味着快乐,高兴。Ratka是女性版本。