Old English beran "to bear, bring; bring forth, produce; to endure, sustain; to wear" (class IV strong verb; past tense bær, past participle boren), from Proto-Germanic *beranan (cf. Old Saxon beran, Old Frisian bera, Old High German beran, German gebären, Old Norse bera, Gothic bairan "to carry, bear, give birth to"), from PIE root *bher- (1) meaning both "give birth" (though only English and German strongly retain this sense, and Russian has beremennaya "pregnant") and "carry a burden, bring" (see infer).
Ball bearings "bear" the friction. Many senses are from notion of "move onward by pressure." Old English past tense bær became Middle English bare; alternative bore began to appear c.1400, but bare remained the literary form till after 1600. Past participle distinction of borne for "carried" and born for "given birth" is from late 18c. To bear (something) in mind is from 1530s.