Common Name: 
Coastal Redwood
Coast Redwood
California Redwood

A single species (see below).
Sequoia: after Sequoiah (1770-1843) (or Sequoyah), son of a British merchant and a Cherokee woman, developed a series of syllable characters allowing the Cherokee language to be written.

Pronunciation: 
se-KWOY-a
Family: 
Cupressaceae