Moona: origin of this surname can be traced to our ancestor Shri Mohan Das ji. Prior to him, no surnames were used as was common in India. Our Gotra is Bhattar.
When the then Government was defining surnames, a government enumerator was told the name of sh Mohan Das ji as surname. Mohan Das ji was a young boy and was called Mohna by people.
Thus came the surname "Mohna" which got refined to "Moona" over several decades. Other known existing spellings are "Mohna" and "Mohona".
Source of this information is the family history keepers known as 'bhat' in Jaisalmer.