Henning (Danish) comes from German Heinrich, from Old High German Heimrih, from Proto-Germanic Haimarīks, from Proto-Germanic rīks, from Proto-Celtic rīxs, from Proto-Indo-European h₃rḗǵs, from Proto-Indo-European h₃reǵ- — to straighten, to right oneself; right; just.
Ancestry of “Henning”, step by step
Henning traces back through two separate lines of ancestry.