As it turns out Spock was originally a woman.
In the Star Trek pilot “The Cage” Enterprise’s second in command was a woman, known only as Number One. However, the TV station decided that the audience would not accept a series with an alien AND a woman on a starship and thus decided to leave the male alien. It was easier to accept a green-blooded pointy-eared alien than a woman in command (no surprises here). Her character was therefore merged with Spock, making him the first officer on Enterprise and giving him the cool, highly logical demeanor of his female predecessor.
I would really like to see Star Trek as it would be if they didn’t scratch this character. She might have become the most interesting heroine of sf.