-logic

Etymology tree
Proto-Indo-European *leǵ-
Ancient Greek λόγος (lógos)
Proto-Indo-European *-h₂
Proto-Indo-European *-éh₂
Proto-Indo-European *-i-eh₂
Proto-Hellenic *-íā
Ancient Greek -ῐ́ᾱ (-ĭ́ā)
Ancient Greek -λογῐ́ᾱ (-logĭ́ā)bor.
Latin -logialbor.
French -logie
Proto-Indo-European *-ikos
Proto-Italic *-ikos
Latin -icuslbor.
Old French -ique
Middle French -ique
French -ique
French -logiquebor.
English -logic
Borrowed from French -logique. By surface analysis, -logy + -ic.