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Since Python 3.2.2 (I don't have earlier version to test with),
>>> "\udc80".encode("utf-8")
UnicodeEncodeError: *utf-8* codec can't encode character '\udc80'...
but
>>> b"\xff".decode("utf-8")
UnicodeDecodeError: *utf8* codec can't decode byte 0xff in position 0
and the table on the documentation of the codec module suggests *utf_8* as the name of the codec, which I believe to be equivalent to "utf_8" because '-' is not a valid character of an identifier.
Can we at least make the above two consistent? I would go for "utf-8", which was probably introduced for rejecting surrogates, but "utf8" has been there for years. What do we do? I am happy to submit patches for all branches. These are one-liners anyway.
The backward compatibility risk should be pretty low as usually you don't get encoding from these errors and I don't see any use of PyUnicode(Encode|Decode)Error_GetEncoding in trunk, although I'm using it for issue #12892. 
Also, "latin_1" displays as *latin-1* but "iso2022-jp" displays as *iso2022_jp*. I care less about this nit though.

> and the table on the documentation of the codec module suggests *utf_8*
> as the name of the codec, which I believe to be equivalent to "utf_8"
> because '-' is not a valid character of an identifier.
typo: equivalent to "utf_8" → equivalent to "utf-8".

New changeset c861c0a7f40c by Victor Stinner in branch '3.2':
Issue #13913: normalize utf-8 codec name in UTF-8 decoder
http://hg.python.org/cpython/rev/c861c0a7f40c
New changeset af1a9508f7fa by Victor Stinner in branch 'default':
(Merge 3.2) Issue #13913: normalize utf-8 codec name in UTF-8 decoder
http://hg.python.org/cpython/rev/af1a9508f7fa 

Use codecs.lookup(alias).name to the the normalize name of a codec. Examples:
>>> import codecs
>>> codecs.lookup('utf-8').name
'utf-8'
>>> codecs.lookup('iso-8859-1').name
'iso8859-1'
>>> codecs.lookup('latin1').name
'iso8859-1'
>>> codecs.lookup('iso2022_jp').name
'iso2022_jp'
All issues look to be addressed, so I close the issue. Thanks for the report!

You need to update test_pep3120: http://www.python.org/dev/buildbot/all/builders/AMD64%20Gentoo%20Wide%203.2/builds/910/steps/test/logs/stdio/text 

New changeset 5b8f146103fa by Victor Stinner in branch '3.2':
Issue #13913: Fix test_pep3120 for the UTF-8 codec name
http://hg.python.org/cpython/rev/5b8f146103fa
New changeset 170a224ce01e by Victor Stinner in branch 'default':
(Merge 3.2) Issue #13913: Fix test_pep3120 for the UTF-8 codec name
http://hg.python.org/cpython/rev/170a224ce01e 

New changeset 824ddf6a30f2 by Victor Stinner in branch '3.2':
Issue #13913: Another fix test_pep3120 for the UTF-8 codec name
http://hg.python.org/cpython/rev/824ddf6a30f2
New changeset 2cfba214c243 by Victor Stinner in branch 'default':
(Merge 3.2) Issue #13913: Another fix test_pep3120 for the UTF-8 codec name
http://hg.python.org/cpython/rev/2cfba214c243