kataas-taasan (Tagalog) comes from Tagalog taas, from Proto-Malayo-Polynesian atas, from Proto-Austronesian aCas, from Proto-Italic akos, from Proto-Indo-European h₂éḱos, from Proto-Indo-European h₂eḱ- — sharp.
kataas-taasan (Tagalog): highest; tallest; loftiest