According to the Social Security Administration, Muhammad is the 345th most popular name in 2018.
https://www.ssa.gov/cgi-bin/babyname.cgi
And, lets be real...if you are naming your newborn in the US, its getting a SSN.
Rest easy folks.
And here are the various spellings and their Rank in 2018:
Name Rank
Mohamed 454
Mohammad 605
Mohammed 627
Muhammad 345