Atis are also called sweetsop in some places.    From Wordnik.com.  [Comments for The Pilgrim's Pots and Pans] Reference

Saramuyo: sugar apple or sweetsop (Annona squamosa).    From Wordnik.com.  [Exotic summer refreshment: a guide to Mexico's tropical fruit] Reference

Anno. na squamosa, sweetsop or custard apple, seedless.    From Wordnik.com.  [Blood Test]

Remarks: The species is related to the cherimoya (A. cherimola), sugar apple or sweetsop (A. squamosa) and to the custard apple (A. reticulata), generally known as mtomoko (Swahili), cultivated for their delicious fruit and commonly sold in Kenyan markets.    From Wordnik.com.  [Chapter 7] Reference

The fruits peculiar to the torrid zone all grow in profusion and among them the native is fondest of the juicy mango, the guava, the aguacate or alligator pear, the anon or custard apple, the guanabana or soursop, the mamon or sweetsop, the mamey or marmalade fruit, the nispero or sapodilla and the tamarind.    From Wordnik.com.  [Santo Domingo A Country with a Future] Reference

Pawpaws are in the same family as the custard-apple, cherimoya, sweetsop, ylang-ylang and soursop, and have similar taste and texture to these fruits.    From Wordnik.com.  [The Kitchn] Reference