The most unusual names I've come across may not be unusual at all in the languages or culture they're from, I'm not sure.
A few examples are Oluwakorede, Tolulope, Eniola, Hannalie, Merrick, Oluwatimileheim, Karizma and Shonit
Unusual names that seem to have more Western roots (again, maybe not all that unusual but once I've only come across the once):
Katinka, Mala, Antigone, Bunty, Desiree, Tree, Jonquil, Amberley
Wilkie, Fitch, K-jay, Ptolemy, Quilliam, Jefferson, Ferdi