*sweblaz

Uncertain. Compare Proto-Indo-European *swelplos (whence probably Latin sulfur), from the root *swel- (‘to burn, smoulder’) (de Vaan); Kluge instead suggests that the Germanic and Latin, while from *swelplos, are borrowed from a pre-Indo-European substrate. This is supported by Kroonen, who additionally adduces Serbo-Croatian sȗmpor (‘sulfur’), Old Armenian ծծումբ (ccumb, ‘sulfur’), Turkish kükürt (‘sulfur’), Hebrew גופרית (gofrít, ‘sulfur’), Mongolian хухэр (xuxer, ‘sulfur’) as cognates from the same source.