How to massively change authors table capitalized valors?

Good day.

I have a WordPress project from a client which every 256 authors have been inserted with capital valors (ex. JOHN KRAUS, LEONARD MILES, NAOMI DAWSON). Right now my client wants those author valors in normal text (ex. John Kraus, Leonard Miles, Naomi Dawson) but I have no idea how to achieve that.

Can anyone tell me?

Huge thanks in advance.

Warm regards.