Most confoozin'! at ASCAP and allmusic.com as well, Genie.

Titles at allmusic.com (Producers and publishers as well as performers, not consistent).

"Christmas Time's A Comin'"- 39, inc. Johnny Cash, Garison Keilor, Rio Diamond, Bill Monroe, Dolly Parton.

"Christmas Times A Coming"- 61, inc Johnny Cash (some), Emmylou Harris, Bill Monroe (some), Raffi, Marty Robbins.
Same title but separate listing, Randy Lehman.

"Christmas a Time's A' Comin'"- 1, Jason Walton.

ASCAP listings:
"Christmas Time is Coming, 1, separate ASCAP copyright listing, performed by Mc Coy, a variant of "Christmas Times ..., etc.

"Christmas Times A Comin," administered by Panther Music Corp. and "Christmas Time's A-Coming," administered by Peer-Southern Organization (with variants).

For information on Clearance of "Christmas Times A Comin," call ASCAP Clearance, 212-621-6160. Title Code 330056872.
Ditto for "Christmas Times A-Coming," Title Code 330210490.

Interestin', ain't it?
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Is Emmylou's version the same as Bill Monroe's?