This is a really bizarre observation, but...if you look at the state voter database (or VoteBuilder or whatever), and look up people born on the 1st of any year, they're way, way disproportionately likely to have Muslim names. Can anyone think of any explanation for that?
Maybe no record of their birth or something?
Yes, and little tradition of remembering birthdays. Should be even more pronounced on January 1st. (With Southern Blacks in the old days you got the opposite issue - they always knew their birthday but usually not the year. Though that of course resulted in their making a number up rather than all be recorded as born in xx00.)