aadhitha - that's not my name

No no no.....I havent added these extra letters to my name for numerological purposes. My name is Adita and I write it as it is. Aadhitha is the spelling that the Tamilians have given to me. Why??After every 'D' and 'T', they put an 'H' although they pronounce it correctly. So when I tell them my name for the first time, this is the spelling they put. ;)