Etymology
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Words related to hard

*kar- 

also *ker-, Proto-Indo-European root meaning "hard."

It forms all or part of: -ard; Bernard; cancer; canker; carcinogen; carcinoma; careen; chancre; -cracy; Gerard; hard; hardly; hardy; Leonard; Richard; standard.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit karkatah "crab," karkarah "hard;" Greek kratos "strength," kratys "strong;" "hard;" Old English heard, German hart "solid and firm, not soft."

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blowhard (n.)
also blow-hard, "blustering person," 1840, a sailor's word (from 1790 as a nickname for a sailor), perhaps originally a reference to weather and not primarily meaning "braggart;" from blow (v.1) + hard (adv.). An adjective sense of "boastful" appeared c. 1855, and may be a separate formation leading to a modified noun use.
die-hard (n.)

also diehard, 1844, in reference to the 57th Regiment of Foot in the British Army, from the verbal phrase die hard "suffer, struggle, or resist in dying," 1784; see die (v.) + hard (adv.). As an adjective, attested from 1871. The  brand of automobile battery, spelled DieHard, was introduced by Sears in 1967.

hard-bitten (adj.)
"tough, tough in a fight," literally "given to hard biting," 1715, originally of hunting dogs, from hard (adv.) + bitten, with the past participle used actively (as in free-spoken).
hard-fought (adj.)
1660s, from hard (adv.) + fought.
hard-wired (adj.)
also hardwired, 1969, in computing, "with permanently connected circuits performing unchangeable functions;" transferred to human brains from 1971; from hard (adv.) + wire (v.).
hard-working (adj.)
also hardworking, 1708, from hard (adv.) + working (adj.).
Barnard 
masc. proper name of Germanic origin, literally "Bear-bold;" see bear (n.) + hard (adj.). In Old French Bernart, in German Bernard.
Gunther 
masc. proper name, also Gunter, Old High German Gundhard, literally "bold in war," from gund "war" (see gun (n.)) + hart "hard, strong, bold" (see hard (adj.)).
hard hat (n.)
also hardhat, hard-hat, late 14c., "helmet," from hard (adj.) + hat (n.). From 1935 as "derby hat;" meaning "safety helmet" is from 1953; used figuratively for "construction worker" from 1970.