The first one emerged red, like a hairy mantle all over; so they named him Esau.

אדמוני RED — a sign that he would always be shedding blood (Genesis Rabbah 63:8).

כלו כאדרת שער means full of hair like a woolen garment that is full of hair old French floche; English flock).

ויקרא שמו עשו AND THEY CALLED HIS NAME ESAU — every one called him thus because he was made (עשה means to make) and fully developed with hair as a lad several years old.

ויצא הראשון אדמוני, even though most newborn babies are reddish in colour, this was one was exceptionally so.

כלו כאדרת שער, as hairy as a fur coat. He had tufts of hair all over him. In both of these regards he was different from other newly born babies.

(27) When the boys grew up, Esau became a skillful hunter, a man of the outdoors; but Jacob became a mild man, raising livestock.(28) Isaac favored Esau because he had a taste for game, but Rebekah favored Jacob.(29) Once when Jacob was cooking a stew, Esau came in from the open, famished.(30) And Esau said to Jacob, “Give me some of that red stuff to gulp down, for I am famished”—which is why he was named Edom.

OF THIS RED, RED POTTAGE. The dish was either reddened by the lentils which were red, or it had been compounded with some red substance, and Esau, not knowing what it was, called it edom (red). Therefore was his name called Edom since they mocked at him for having sold an honorable birthright for a small dish. For the drunkard and the glutton shall come to poverty.