Fun Facts and Stats About Names Dog names, cat names, and humans too: Facts and Stats about the last name Grennan Life expectancy, age, gender, popularity, net worth, social media, biography, and more!about the data Did you know that most people with the surname Grennan are born on a Sunday? Persons with last name Grennan are often times of exceptional health and do not require expensive health insurance but should learn about Medicare eligibility. And here is why: The average life expectancy of people named Grennan in the United States recorded since 1880 is: 76.0 years 348 deaths of humans with the surname Grennan have been reported to the SSA ever since. The average life expectancy for the lastname Grennan is: 76.0 years The majority of persons with the surname Grennan are born in December and die in October born dead Most person with the the last name grennan live in the state of New York. 30.6% live in New York 18.8% live in Illinois 8.7% live in California If you don't like people named grennan you should probably move to Maine (None live there). Cool fact: Connecticut is the state with the most last name grennan per capita. Check out the popularity of the last name grennan for each state in the map below. Do you have more info on the ancestry, history, family tree, or heritage of Grennan ? Do you know the meaning of the name Grennan ? Share it with friends to start a fun discussion! Facebook Twitter Reddit Is the name grennan only for humans? Apparently so ¯\_(ツ)_/¯ We don't know of any cats or dogs named grennan Compare the last name Grennan to other random last names: Fell Ferris Negro Poe