For web this is done with 1 line of Javascript and a div with rounded borders, really

   const initials = name.split(' ').map((n) => n.substr(0,1)).slice(0,2).join('')

   <div style="border-radius: 9999px; background-color: navy">
     <initials here>
   </div>

Adjust width, height, font-size to your liking