Where does “dere” come from?

dere (Norwegian Bokmål) comes from Old Norse þér, from Old Norse ér, from Old Norse es, from Proto-Germanic īz, from Proto-Indo-European ís — this, he (used as the 3rd person pronoun).

dere (Norwegian Bokmål): you

Definitions

Ancestry of “dere”, step by step

Step	Language	Word	Meaning
1	Old Norse	þér	you
2	Old Norse	ér	"nom. pl." to ‘þú’, ye
3	Old Norse	es	that; is; as
4	Proto-Germanic	īz	he, she, it, they; 3rd person personal pronoun
5	Proto-Indo-European	ís	this, he (used as the 3rd person pronoun)

Every word from Proto-Indo-European ís →Every word from Proto-Germanic īz →Every word from Old Norse es →