Definition: Chief (n.)
c. 1300, "head, leader, captain; the principal or most important part of anything;" from Old French chief "leader, ruler, head" of something, "capital city" (10c., Modern French chef), from Vulgar Latin *capum, from Latin caput "head," also "leader, chief person; summit; capital city" (from PIE root *kaput- "head"). Meaning "head of a clan" is from 1570s; later extended to American Indian tribes. Commander-in-chief attested from 1660s. 
In October 2017 a school district board in Ontario passed a motion to remove “chief” from all job titles out of respect for Indigenous communities. The action was, according to a school district spokesperson, a proactive step towards reconciliation. There was a mixed reaction to the move but the most common response, from both Indigenous and non-Indigenous people, was confusion.