An Etymological Dictionary of Astronomy and Astrophysics

To, toward, or in a more elevated position.

Etymology (EN): M.E. up(pe) (adv.), O.E. up(p) “to a higher position;” cf.
O.Frisian up, O.S. up, M.Du. up, op, O.N. upp;
O.H.G. uf; (Ger. auf), Goth. iup.

Etymology (PE): Bâlâ “up, above, high, elevated, height” (related to boland “high,” borz “height, magnitude” (it occurs also in the name of the mountain chain Alborz),
Lori dialect berg “hill, mountain;” Mid.Pers. buland “high;” O.Pers. baršan- “height;” Av. barəz- “high, mount,” barezan- “height;” cf.
Skt. bhrant- “high;” L. fortis “strong” (Fr. & E. force); O.E. burg, burh “castle, fortified place;”
Ger. Burg “castle;” Goth. baurgs “city;” E. burg, borough; Fr. bourgeois, bourgeoisie, faubourg); PIE base *bhergh- “high.”