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Spanish word ayer comes from Proto-Indo-European *dʰǵʰyes-, Proto-Indo-European *dʰǵʰyes, and later Proto-Indo-European *dʰǵʰyési (Yesterday.)
*dʰǵʰyes- (Proto-Indo-European)
yesterday
*dʰǵʰyes (Proto-Indo-European)
*hesī (Proto-Italic)
*dʰǵʰyési (Proto-Indo-European)
Yesterday.
*hezī (Proto-Italic)
heri (Latin)
Yesterday.
ayer (Spanish)
Yesterday (figuratively) day's gone by; yesteryear; the past. Yesterday.