The name Nikki is typically associated with the female gender.
While it is possible for someone named Nikki to be male, it is statistically much more common for the name to be given to females. This is due to cultural and societal norms, where certain names are traditionally associated with specific genders.
It is important to remember that names are just labels, and a person's gender identity is a personal and individual matter.
If you are unsure about someone's gender, it is always respectful to use gender-neutral language or ask politely about their preferred pronouns.