The name Calix is a boy's name of Greek, Latin origin meaning "chalice". Calix and is often added to lists like Best Cool Unusual Boys' Names and discussed in our forums with posts like "Quintuplet Boys!".
From the experts:
Calix is starting to be very quietly used (26 boys in the U.S. were named Calix in 2016), probably thanks indirectly to actress Calista Flockhart, who brought one female version of this attractive Greek name to prominence. A calyx is also a funnel or chalice-shaped part of a flower.