Why is it called olympic national park?

Answer 1

Olympic gets its name from the mountain range within the park.

According to wikipedia:

The mountains were originally called "Sun-a-do" by the Duwamish Indians, while the first European to see them, the Spanish navigator Juan Perez, named them "Sierra Nevada de Santa Rosalia", in 1774. But the English captain John Meares, seeing them in 1788, thought them beautiful enough for the gods to dwell there, and named them "Mount Olympus" after the one in Greece. Alternate proposals never caught on, and in 1864 the Seattle Weekly Gazette persuaded the government to make the present-day name official.