german (1) Look up german at Dictionary.com
"of the same parents or grandparents," c.1300, from O.Fr. germain, from L. germanus "of brothers and sisters," related to germen (gen. germinis) "sprout, bud," dissimilated from PIE *gen(e)-men-, from base *gene- "to give birth, beget" (see genus). Your cousin-german (also first cousin) is the son or daughter of an uncle or aunt; your children and your first cousin's are second cousins to one another; to you, your first cousin's children are first cousin once removed.
German (2) Look up German at Dictionary.com
"Teuton," 1520s, from L. Germanus, first attested in writings of Julius Caesar, who used Germani to designate a group of tribes in northeastern Gaul, origin unknown, probably the name of an individual tribe. It is perhaps of Gaulish (Celtic) origin, perhaps originally meaning "noisy" (cf. O.Ir. garim "to shout") or "neighbor" (cf. O.Ir. gair "neighbor"). The earlier English word was Almain or Dutch. Their name for themselves was the root word of modern Ger. Deutsch (see Dutch). Roman writers also used Teutoni as a German tribal name, and Latin writers after about 875 commonly refer to the German language as teutonicus. See also Alemanni and Teutonic. The German shepherd (dog) (1922) translates Ger. deutscher Schäferhund