köken: From Old Galician-Portuguese feliz, a semi-learned borrowing from Latin fēlīx, fēlīcem which displaced the inherited form fiiz; from Proto-Indo-European *dʰeh₁-lw-i, from *dʰeh₁(y)- (“to suckle”).
Etymology tree Proto-Slavic *bolgъ Polish błogi Inherited from Proto-Slavic *bolgъ. First attested in the 16th century. Doublet of błahy (“insignificant”).