Old English boren, alternative past participle of beran (see bear (v.)). The -en of the Middle English past participles tended to drop the -e- in some verbs, especially after vowels, -r-, and -l- , hence also slain, etc., Middle English stoln. "In modern use the connexion with bear is no longer felt; the phrase to be born has become virtually an intr. verb" [OED].
It is attested from early 14c. as "possessing from birth the character or quality described" (born poet, born loser, etc.). It is from 1710 as "innate, inherited;" the colloquial expression in (one's) born days "in (one's) lifetime" is by 1742. The distinction of born from borne (q.v.) is 17c.
"inheriting liberty," mid-14c., from free (adj.) + born. Old English had freolic (adj.) "free, free-born; glorious, magnificent, noble; beautiful, charming," which became Middle English freli, "a stock epithet of compliment," but which died out, perhaps as the form merged with that of freely (adv.).