The Indian name Mohandas is a patronymic, not a family name; thus, the person should be referred to by her given name, "Mamta".
Mamta Mohandas is an Indian film actress and playback singer. She has mainly acted in Malayalam films, besides a few Telugu and Tamil productions and one Kannada film. She has won two Filmfare Awards, for Best Female Playback Singer in Telugu in 2006 and for Best Actress in Malayalam in 2010. Wikipedia