Citations:telonym

Noun: "a term formed from the terminal letter or letters of several words"

 * 1987 — Wolfgang U. Dressler, Leitmotifs in Natural Morphology, pages 116-117
 * One consequence is that a general device for abbreviations is to form acronyms (cf. Bauer 1983: 237f), but never "telonyms", as far as I know.
 * 2011 — Moses Mendelssohn (edited by Michah Gottlieb), Moses Mendelssohn: Writings on Judaism, Christianity, and the Bible, page 180
 * If the matter that is expounded does not follow from the precise nature of the words and statements in the manner we have discussed, but rather from acronyms,8 telonyms,9 combinations of letters,10

Noun: "a pseudonym formed in this way from an author's first name or full name"

 * 1961 — W. D. Paden, "Twenty New Poems Attributed to Tennyson, Praed, and Landor: Part One", Victorian Studies (March), page 12
 * Further, as Alfred Tennyson was allotted the telonym D. (perhaps because T. signified Trench and A. might be misinterpreted as Arthur)
 * 1989 — Adair Michael Dunne, Books and readers, 1605: a descriptive catalogue of all books printed in England, Scotland, and Ireland, or in English abroad in the year 1605, Volume 1, page 252
 * The letters M. N. on A4r are a telonym for William Camden.