Irish: aingeal
Scots Gaelic: aingeal
Welsh: angel
There is no single language alive today called Celtic.
In Irish it's Siobhán, Lúcás, Aingeal
In Irish it's "fiáin"
angelfish My dictionary has angel food, (as in the cake) as two words.
In Irish it's feall / brath
I don't know if 'Green man' actually is used in Celtic languages. The wikipedia article mentions an ancient Celtic god called Viridios which may derive from 'green'.
'without an end' or 'by ourselves'
Gabriel (or Jibril) is the angel who conveyed God words of Quran to prophet Muhammad (PBUH).
Angel.
angel
The words of the angel Gabriel to Mary are recorded in Luke 1 :28 - 37.
In Irish it's lúbra / cathair gríobhháin