The LORD
Yhovah (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
reigneth
malak (maw-lak')
to reign; inceptively, to ascend the throne; causatively, to induct into royalty; hence (by implication) to take counsel
let the earth
'erets (eh'-rets)
the earth (at large, or partitively a land) -- common, country, earth, field, ground, land, natins, way, + wilderness, world.
rejoice
giyl (gheel)
to spin round (under the influence of any violent emotion), i.e. usually rejoice, or (as cringing) fear -- be glad, joy, be joyful, rejoice.
let the multitude
rab (rab)
abundant (in quantity, size, age, number, rank, quality)
of isles
'iy (ee)
a habitable spot (as desirable); dry land, a coast, an island -- country, isle, island.
be glad
samach (saw-makh')
probably to brighten up, i.e. (figuratively) be (causatively, make) blithe or gleesome
thereof
