I don't think
Toni counts as a "msculine nickname" unless it's spelled
Tony.
Maxine "
Max"
Wilhelmina "
Will", "
Billy"
Jessica "
Jesse" (maybe... idk if using
Jesse instead of
Jessie makes it masculine though)
Ariana "
Ari" (more unisex though)
Vincenza "
Vince"
Jacqueline "
Jack", "
Jake"
Leonora "
Leo"
Michaela "
Mike", "
Mick"
Danielle "
Dan"
Kaia "
Kai"