Helmolt (Danish) comes from Old High German helm, from Proto-West Germanic helm, from Proto-Germanic helmaz, from Proto-Germanic halmaz, from Proto-Indo-European ḱolh₂mos, from Proto-Indo-European ḱelh₂- — to pierce, strike; to stick; prick; stab.
Ancestry of “Helmolt”, step by step
Helmolt traces back through two separate lines of ancestry.