Sigma Octantis (Dec -88°55') is sometimes referred to as 'Polaris Australis', amongst others in Burnham's Handbook Vol. II.
Whether or not this is an officially IAU-approved label I'm not sure - I even wonder if there is a standard for common star names, given the confusion about all these Deneb's, Suhail's etc.... and we won't go into the different transcriptions of arabic names
