I have noticed that spelling error always done by people with very superficial knowledge of India. I don’t know where the “Ghandi” came from but it is incorrect. “Gandhi” is correct. I was born and raised in the state where the Mahatma was born.
“Gh” is common in English. “Dh” isn’t. So it’s not surprising that people who remember that there’s an “h” somewhere in the name so often get it wrong.