An Etymological Dictionary of the German Language/Strang
Strang, m., ‘rope, string, halter, trace,’ from MidHG. stranc, strange, m. and f., OHG. strang, m., ‘string, rope’; comp. Du. streng, AS. stręng, E. string, OIc. strengr, ‘string, strap.’ This Teut. strangi- seems to be the adj. streng (lit. ‘strong’), used as a subst. Yet Strang, like Gr. στραγγάλη, ‘string,’ and Lat. stringere, ‘to draw tight,’ might be connected with an Aryan root strenk (streng), ‘to turn.’