masc. proper name, from French Henri, from Late Latin Henricus, from German Heinrich, from Old High German Heimerich, literally "the ruler of the house," from heim "home" (see home (n.)) + rihhi "ruler" (from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line," thus "to lead, rule"). One of the most popular Norman names after the Conquest. Related: Henrician.

masc. proper name, Scottish, from Gaelic Caioneach, literally "handsome, comely."

masc. proper name, Old English Ælfræd, literally "elf-counsel," from ælf (see elf) + ræd "counsel" (see rede). Alfred the Great was king of the West Saxons 871-899. Related: Alfredian (1814).

masc. proper name, from Old French rousel, diminutive of rous "red," used as a personal name. See russet. Also a name for a fox, in allusion to its color. Compare French rousseau, which, like it, has become a surname. Russell's Paradox, "the set of all sets that do not contain themselves as elements," is named for Bertrand Russell (1872-1970) who is said to have framed it about 1901.

type of terrier (not recognized as a distinct breed), 1907, named for the Rev. John Russell (1795-1883) of Devonshire, "the sporting parson."

transuranic element, 1957, named for Alfred Nobel (q.v.). With metallic element ending -ium.

method of exercise and a fad in early 1980s, American English, coined 1968 by U.S. physician Kenneth H. Cooper (b. 1931), from aerobic (also see -ics) on the notion of activities which require modest oxygen intake and thus can be maintained.

masc. proper name, a familiar form of Henry. Weekley takes the overwhelming number of Harris and Harrison surnames as evidence that "Harry," not "Henry," was the Middle English pronunciation of Henry. Compare Harriet, English equivalent of French Henriette, fem. diminutive of Henri.

1863, in reference to guns made at the armaments works in Essen, Germany, founded by German metallurgist Alfred Krupp (1812-1887).

county in Leinster, Ireland. The county is named for its town, from Irish Cill Chainnigh "Church of (St.) Kenneth" (see kil-). The story of the Kilkenny cats, a pair of which fought until only their tails were left, is attested from 1807.