Etymology tree Latin norma Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālis Latin nōrmālisder. English normal Proto-Indo-European *leyg-der. Proto-Germanic *līkąder. Proto-Germanic *-līkaz Proto-Germanic *-ê Proto-Germanic *-līkê Proto-West Germanic *-līkē Old English -līċe Middle English -ly English -ly English normally From normal + -ly.