Pennsylvania

wiktionary

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Penn(“William Penn”) +‎  sylvan(“woods”) +‎  -ia(“land”). On March 4, 1681, Charles II of England granted a land tract to William Penn for the area that now includes Pennsylvania. Penn then founded a colony there as a place of religious freedom for Quakers, and named it for the Latin sylva,  silva(“meaning "wood"”), thus "Pennsylvania" (Penn's woods). 

etymonline

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Pennsylvania

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.