Hendrik (Dutch) comes from Middle Dutch Hendric, from Old Dutch Hēmrīk, from Proto-Germanic *Haimarīk, 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.