Yes. I am Telugu and family name is usually not written or called out. So he would usually write D. Gukesh or Gukesh D. Most people also have a sort of middle n

Yes. I am Telugu and family name is usually not written or called out. So he would usually write D. Gukesh or Gukesh D. Most people also have a sort of middle name for example D. Gukesh Kumar. Middle name is spelled and used for calling together with main name.