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SS lists the most popular male names in the US over the last 100 years as James (4.7M), John (4.5M), Robert (4.5M), and Michael (4.3M).[1]

Using standard US mortality data, Wolfram Alpha reports estimates of 3.853M and 3.26M for Michael and John respectively, currently alive in the US.[2][3]

[1]: https://www.ssa.gov/oact/babynames/decades/century.html

[2]: https://www.wolframalpha.com/input/?i=michael

[3]: https://www.wolframalpha.com/input/?i=john