xalla. arenal. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 158v. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
XĀLLAH sandy place, beach / arenal (M) [(2)Zp.13,227]. See XĀL-LI, -TLAH. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 321.