Zachar: Usually translated as “male” in English.
Nekevah: Usually translated as “female” in English.
Androgynos: A person who has both “male” and “female” sexual characteristics. [Source: 149 references in Mishna and Talmud (1st-8th Centuries CE); 350 in classical midrash and Jewish law codes (2nd -16th Centuries CE).]
Tumtum: A person whose sexual characteristics are indeterminate or obscured. [Source: 181 references in Mishna and Talmud; 335 in classical midrash and Jewish law codes.]
Ay’lonit: A person who is identified as “female” at birth but develops “male” characteristics at puberty and is infertile. [Source: 80 references in Mishna and Talmud; 40 in classical midrash and Jewish law codes.]
Saris: A person who is identified as “male” at birth but develops “female” characteristics as puberty and/or is lacking a penis. A saris can be “naturally” a saris (saris hamah), or become one through human intervention (saris adam).  [Source: 156 references in mishna and Talmud; 379 in
classical midrash and Jewish law codes.]

Source:  Classical Jewish Terms for Gender Diversity by Rabbi Elliot Kukla, 2006

Our Sages non-judgmentally explore the role of intersex people in regards to many facets of ritual and civil law such as circumcision, redemption, oath-taking and menstruation.

The midrash, in Bereshit Rabah, posits that Adam, the first human being, was actually an androgynos. While in the Babylonian Talmud (Yevamot 64a-64b) the radical claim is made that Abraham and Sarah were tumtumim, gender non-conforming people. According to our tradition the first human being and the first Jews were gender outlaws. This teaches us that it is those that transgress the apparently rigid lines of Judaism that have caused the tradition to grow.

— Rabbi Elliot Kukla, Parashat Vayechi: Beyond Stick Figures

If we can have six, why not seven?  Why not a million?  However many we need?