Steinkern (German) comes from German Kern, from Middle High German kern, from Old High German kerno, from Proto-Germanic kernô, from Proto-Indo-European ǵr̥h₂nóm, from Proto-Indo-European ǵr̥h₂nós, from Proto-Indo-European ǵerh₂- — to grow old, to mature.
Ancestry of “Steinkern”, step by step
Steinkern traces back through two separate lines of ancestry.