阿彌陀經疏 1.122

1.122

經曰：「有世界名曰極樂」，次釋第三國號也。此即處圓淨，《無量壽經》名安樂。若《清淨覺》及《大阿彌陀經》竝云國名須摩提，須摩提者應是梵語，安樂極樂應是漢音。若《鼓音經》世界名安樂，如來所生之國名清泰，聖王所住，其城縱廣十千由旬，於中充滿剎利之種，國名如後釋。

The sūtra says: 'There is a world named Sukhāvatī.' Next is the explanation of the third [passage], the name of the country. This is the complete purity of the place; the Infinite Life Sūtra names it 'Peace and Joy' (Anle). The Qingjing jue jing and the Da Amituo jing both say that the country is named Sumati. 'Sumati' should be Sanskrit, while 'Peace and Joy' (Anle) and 'Utmost Joy' (Sukhāvatī) should be the Chinese pronunciations. According to the Drum Sound Sūtra, the world is named Peace and Joy (Anle), the country in which the Tathāgata was born is named Pure and Peaceful (Qingtai), where a sacred king dwells, its city measuring ten thousand yojanas in length and breadth, filled with the kṣatriya lineage; the country's name is as explained later.