The behavior of 'who'

[walt]

Is this the expected output for an unexpected input?:

$ who /etc
.                         May  9 03:09 (
?)
netconfig        ??      Jan 10 11:57 ()
ices                     Oct 23 13:41 (hosts)
                b        Sep  8 18:48 (gnats)
                         Jan 10 11:31 (?<)
e                        Feb 18 17:56 (db)
<much more output snipped>