Latinised as Melburnia + -ian.
The use of the term Melburnian in its Latin form can be traced back to 1876 where the case for Melburnian over Melbournian was made in the Melbourne Grammar School publication, the Melburnian. 'The diphthong, ‘ou’ is not a Latin diphthong: hence, we argued this way, Melburnia would be [the] Latin form of name, and from it comes Melburnian.' 
Melburnian (plural Melburnians)
- Of, from or relating to Melbourne.