The best replacement for cn is nick.

The best alternatives to cn are rated as following:
★★★★★  nick
★★★★★  cp
★★★★★  ou
★★★★★  cs gas
★★★★  dn
★★  uid
★★  dn ldap
★★  samaccountname
★  com cn
★  cartoon network
★  cn
★  csa
  displayname

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Speaking about cn, one probably shouldn't forget about lialh4.

Other search terms related to cn and their ratings are:
★★★★★ lialh4
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Google Trends

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nick
cp