The best replacement for uid is gid.

The best alternatives to uid are rated as following:
★★★★★  gid
★★★★★  euid
★★★★  uuid
★★  cn
★★  aadhar
★  samaccountname
★  cn ldap
  uid
  iuid
  real uid

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No companions for uid have been suggested so far.
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uid
gid
euid