There are 278 babies born every minute. 2-14 of them are trans, depending on various estimates. Every day, it is likely that someone is born who will one day grow up to have a gender unlike that of any living person, even if they are never exposed to the right culture and information to find this gender within themself.
They are not evenly distributed
That’s a big part of why there is bigotry; people aren’t aware of out-of-1-sigma examples