With ~125k total names since the 1940's, it's not really close to one of the most common in the US; just one that was in the top 100 for 2 decades.
"Alexandra" seems way more common than "Alexa".
With ~125k total names since the 1940's, it's not really close to one of the most common in the US; just one that was in the top 100 for 2 decades.