The first English version (see James J. Fuld, The Book of World-Famous Music, 5th ed., p. 193) has some differences: Hall (without -s) in the title, some other words, and music in the repeated part. "See the blazing yule before us" is in the original. The author of the lyrics is not mentioned. It is arranged as a four-part piece.

X:1
T:Deck the Hall with Boughs of Holly
M:C
L:1/8
C:Welsh Air
B:J. P. McCaskey, Franklin Square Song Collection, [No. 1], 1881, p. 120
K:F
c3 B A2 G2 | F2 G2 A2 F2 |G A B G A3 G|F2 E2 F4|
w:1.Deck the hall with boughs of hol-ly, Fa la la la la la la la la,
w:2.See the blaz-ing yule be-fore us,
w:3.Fast a-way the old year pass-es,
c3 B A2 G2|F2 G2 A2 F2|G A B G A3 G|F2 E2 F4|
w:'Tis the sea-son to be jol-ly, Fa la la la la la la la la,
w:Strike the harp and join the cho-rus,
w:Hail the new, ye lads and lass-es!
|:G3 A B2 G2|A3 B c2 A2|c3 B A2 G2|F2 G2 A2 F2|
w:Don we now our gay ap-par-el, Troll the an-cient Christ-mas car-ol,
w:Fol-low me in mer-ry mea-sure, While I tell of Christ-mas trea-sure,
w:Sing we joy-ous all to-geth-er, Heed-less of the wind and weath-er,
d d d d c3 B|A2 G2 F4 :|]
w:Fa la la la la la la la la.

The music sounds truncated, but that's what it was in the song book.