sylvan adj.

American colony, later U.S. state, 1681, literally "Penn's Woods," a hybrid formed from the surname Penn (Welsh, literally "head") + Latin sylvania (see sylvan). Not named for William Penn, the proprietor, but, on suggestion of Charles II, for Penn's late father, Admiral William Penn (1621-1670), who had lent the king the money that was repaid to the son in the form of land for a Quaker settlement in America. The story goes that the younger Penn wanted to call it New Wales, but the king's secretary, a Welshman of orthodox religion, wouldn't hear of it. Pennsylvania Dutch (adj.) in reference to the German communities of the state, which retained their customs and language, is attested from 1824.

mid-13c. (late 12c. as a surname), of animals, "ferocious;" c. 1300, "wild, undomesticated, untamed," also "wild, uncultivated" (of land or places), from Old French sauvage, salvage "wild, savage, untamed, strange, pagan," from Late Latin salvaticus, alteration (vowel assimilation) of silvaticus "wild, woodland," literally "of the woods," from silva "forest, grove" (see sylvan).

Of persons, "indomitable, valiant," also "fierce, bold, cruel" (c. 1300); from late 14c., of persons or behavior, "wild, barbarous, uncivilized;" c. 1400 as "reckless, ungovernable," and by 1610s as "pertaining to or characteristic of savage peoples, living in the lowest condition of development." In heraldry, "naked or clothed in foliage" (1570s). The -l- often was restored in 16c.-17c. English spelling.