تهران

Etymology
There are various theories pertaining to the origin of the name Tehran:


 * One theory is that the word "Tehran" is derived from Tiran/Tirgan, "The Abode of ", a Zoroastrian deity. The ancient Parthian town of Tiran was a neighbour to the town of Mehran, "The Abode of ", the Zoroastrian deity of light. Both of these were mere villages in the suburbs of the great city of.
 * Another theory is that Tehran means "a warm place", opposed to Shemiran, a cooler district in northern Tehran.
 * The official City of Tehran website claims that "Tehran" comes from the Persian words and . Given Tehran's geographic position at the bottom of the slope of the, this appears to be the most plausible explanation of the origin of the name of the city.

Pronunciation

 * pronunciation shift from tahrān to tehrān/tehrân occurred around the 20th century
 * pronunciation shift from tahrān to tehrān/tehrân occurred around the 20th century