At <a href="https://www.ssa.gov/oact/babynames/index.html" rel="nofollow">https://www.ssa.gov/oact/babynames/index.html</a> you can query the "popularity" (meaning frequency) of a name by year. Alexa seems to have jumped in popularity from 2014 to 2015 and fallen since then, to its lowest level in this century, but not all that dramatically: even in 2018 it was the 90th most popular female name ("0.165 percent of total female births in 2018"; "0.311 percent of total female births in 2015").<p>Amazon Alexa was announced in November 2014, says Wikipedia, so it makes sense: in 2015 people will have heard the name a lot but not yet understood the implications.