Why would a name letter bias be biological caused? Or do you mean bias about biological factors?

Bear in mind "bias" is just a perjorative for "generalisation" or alternatively "lesson learned". AI algorithms are good at detecting patterns in data and bad at being politically correct. This is not a flaw of the algorithms, it's a flaw in people who can't accept measured reality and go into denial.

So an AI trying to hire programmers discriminates against female sounding names, because it's learned that this is correlated with success? Apply it to hiring nurses or primary school teachers and it'll probably do the opposite. This is only "bias" if you start from ideologically driven blank slate assumptions. Otherwise it's just common sense.