onomatomancy

Etymology tree
Proto-Indo-European *h₁nómn̥
Proto-Hellenic *ónomə
Ancient Greek ὀνόμᾰτος (onómătos)der.
English onomato-
Ancient Greek μάντις (mántis)
Ancient Greek -εύς (-eús)
Ancient Greek -εύομαι (-eúomai)
Ancient Greek μᾰντεύομαι (mănteúomai)
Proto-Indo-European *-h₂
Proto-Indo-European *-éh₂
Proto-Indo-European *-i-eh₂
Proto-Hellenic *-íā
Ancient Greek -ῐ́ᾱ (-ĭ́ā)
Ancient Greek μᾰντείᾱ (mănteíā)der.
Latin -mantīabor.
English -mancy
English onomatomancy
From onomato- + -mancy.