An Etymological Dictionary of the German Language/Säule
Säule (1.) (Bav. Saul), f., ‘pillar,’ from the equiv. MidHG. sûl (plur. siule), OHG. sûl (plur. sûli), f.; comp. Du. zuil, AS. sŷl; OIc. súla, ‘pillar’; also, with gradation, Goth. sauls, f., ‘pillar.’ Perhaps Schwelle is primit. allied.
Säule (2.), f., ‘awl,’ from MidHG. siule, OHG. siula, f., ‘awl, punch’ (Goth. *siwila, f.); connected with the Aryan root sī̆w, “the primit. word for leather-work” (see Ahle). Comp. Goth. sinjan, OHG. siuwan, AS. seówian, E. to sew; also Lat. suo, ‘I sew,’ sutor, ‘cobbler,’ Gr. κασ-σύω, ‘to patch, stitch,’ Sans. root sîw, ‘to sew,’ OSlov. ši-ti, ‘to sew.’ In a sense corresponding to that of MidHG. siule we find Lat. subula and OSlov. šilo, which are formed from the same root. Comp. the following word.