属于加在名字后面的后缀，意为“亲爱的”
转自维基百科：
Jan (Persian: جان) or Jaan is a Persian word originally meaning "life" and "soul", also used as a name with extended meanings "beloved one" or "dear". Being of Persian origin, it is much used in Urdu-speaking India and Pakistan as well as in Afghanistan, Central Asia, and other areas influenced by Persian culture.
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