Unisex names are special because they can be used as names for both boys and girls.
About 8 % of common unisex names in the US begin with the letter S… On the other hand, only 5.9 % of common boys' names begin with the letter S, while 10.2 % of girls' names do. This means that the initial S is much more common in girls’ names, but less so in boys' names.
We classify names as unisex that are not just officially suitable for both boys and girls, but which have actually been used many times in the English-speaking world for both boys and girls in recent years. Some of the unisex names may have more female or male connotations for individuals, but this is often subjective and goes back to the fact that in your own circle of acquaintances, you might have a boy or man, or a girl or a woman, who has this name.