Grinch  was predictably popularized by Dr. Seuss in 1957, but he was not the first author to use it. Rudyard Kipling included it as an onomatopoetic participle grinching, or harsh grating  in the 1892 poem The Lament of the Border Cattle Thief. 

: one who spoils the pleasure of others : killjoy, spoilsport.