Edward Kasner

In the late 1930s, he was once asked to come up with a name for a very large number. He outsourced this task to his nephew, Milton Sirotta, who in turn coined the word "googol." A googol is 10 raised to the 100th power (i.e., a 1 followed immediately by a hundred zeros.) Though not famous, he is of important note for his contribution to mathematics and physics. He is an under-recognized genius.