locale en_EN vs. en_GB/en_US

Does the locale en_EN exist? $ python -c 'import locale; print locale.normalize("english");' en_EN.ISO8859-1 $ LANG=en_EN locale -k LC_NAME locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory name_fmt="%p%t%g%t%m%t%f" name_gen="" name_mr="" name_mrs="" name_miss="" name_ms="" name-codeset="ANSI_X3.4-1968" $ LANG=en_GB locale -k LC_NAME name_fmt="%d%t%g%t%m%t%f" name_gen="" name_mr="" name_mrs="" name_miss="" name_ms="" name-codeset="ISO-8859-1" $ LANG=en_US locale -k LC_NAME name_fmt="%d%t%g%t%m%t%f" name_gen="" name_mr="Mr." name_mrs="Mrs." name_miss="Miss." name_ms="Ms." name-codeset="ISO-8859-1"