From Wikipedia:

The mountain is named after Annapurna, the Hindu goddess of food and nourishment, who is said to reside there. The name Annapurna is derived from the Sanskrit-language words purna ("filled") and anna ("food"), and can be translated as "everlasting food".[8] Many streams descending from the slopes of the Annapurna Massif provide water for the agricultural fields and pastures located at lower elevations.[9]