Where does “Hedjet” come from?

Hedjet (English) comes from Egyptian ḥḏt, from Egyptian ḥḏ — to be white; to set off at dawn; silver.

Ancestry of “Hedjet”, step by step

Step	Language	Word	Meaning
1	Egyptian	ḥḏt	hippopotamus
2	Egyptian	ḥḏ	to be white; to set off at dawn; silver