many (adj.) Look up many at Dictionary.com
Old English monig, manig "many, many a, much," from Proto-Germanic *managaz (source also of Old Saxon manag, Swedish mången, Old Frisian manich, Dutch menig, Old High German manag, German manch, Gothic manags), from PIE *menegh- "copious" (source also of Old Church Slavonic munogu "much, many," Old Irish menicc, Welsh mynych "frequent," Old Irish magham "gift"). Pronunciation altered by influence of any (see manifold).
many (n.) Look up many at Dictionary.com
Old English menigu, from many (adj.). The many "the multitude" attested from 1520s. Compare also Gothic managei "multitude, crowd," Old High German managi "large number, plurality," German Menge "multitude."