There is no such language as elvish. The language that J R R Tolkein used in his landmark trilogy, 'The Lord of the Rings', was, I believe (its an awful long time since I read them), loosely based on Old Welsh. Although there is a book I once saw called something like 'the lord of the rings companion' that had a glossary of words and terms used by Tolkein to create his masterpiece. Another avenue of research you might try is the 'Book of Kells' - which is written in Gaelic: a language closely allied with the Old Celtic script used in the Lord of the Rings. Tolkein also uses runic characters (Old Norse/Icelandic) but these are associated with the engravings of the dwarves.