Anastas rhymes with:
augusta's, costas, kostas, maestas, mestas, pastas, preyistas, sabatista's, sabatistas, sabatistas', sandinistas, sandinistas', shasta's, vista's, vistas, zapatista's, zapatistas
Anastas sounds like:
amnesties, amstutz, anacostia's, anaesthesia, anastasi, anastasia, anastasio, anastos, anecdotes, anestachio, anesthesia, anesthetic, anesthetics, animists, animosities, anschutz, anstice, anstiss, anxieties