Tarzana Ranch (1921)
Birth of Tarzana, California:

In 1918, Tarzan's creator, Edgar Rice Burroughs, bought an estate in the San Fernando Valley and named it Tarzana Ranch. When it was subdivided for homes in 1923, it was called Tarzana Tract, and in 1930, the Post Office called the community Tarzana.
Source: Los Angeles Times, 11/15/1990

Tarzan mourning the death of his ape mother "Kala"
First Tarzan Movie:

Tarzan of the Apes (1918)
The silent screen adaptation of Burrough's first Tarzan story starred Elmo Lincoln (formerly a locomotive engineer named Otto Elmo Linkenletter).
Source: Baltimore Sun, 5/3/2007

"Tarzan of the Apes" appears in All-Story Magazine:

October 1912
Edgar Rice Burroughs wrote "Tarzan of the Apes", selling the piece for $700. In the language created for Tarzan by Burroughs, "tar" meant "white", while "zan" meant "skin."
Source: Brewer's Dictionary of Modern Phrase & Fable, By Adrian Room, 1/1/1900