I wreiddiol awgrymwyd y term "Feisire Dáil Eireann" (F.D.E.),<ref>e.g.
* {{cite encyclopedia |chapterurl=https://archive.org/stream/encyclopaediabri31chisrich#page/574/mode/1up |article=Ireland |page=573 |volume=31 |encyclopedia=Encyclopædia Britannica |edition=12th |authorlink=Walter Alison Phillips |first=Walter Alison |last=Phillips |date=1922 |accessdate=21 October 2016 |quote=The victorious group assumed the title of the Irish Republican party, and styled themselves not M.P., but F.D.E. (''Feisire Dail Eireann'', ''i.e.'' members of the Assembly of Ireland).}};
* ''[[Cork Examiner]]'', 21 JanuaryIonawr 1919, "The M.P.s, or F.D.Es (Feisire Dáil Eireann) as they will be known in future, [etc.]" (cited in {{cite thesis |url=http://othes.univie.ac.at/1195/1/2008-09-03_8305662.pdf#page=694 |format=PDF |title=Irish Views on Old Austria and Austrian Views on the Irish Question, 1848–1918|last=Ferris|first=Lisa|date=September 2008|publisher=University of Vienna|page=609 |accessdate=21 October 2016}})</ref> ond yn hytrach, defnyddiwyd "Teachta" o'r cyfarfod cyntaf.<ref>{{cite web|url=http://oireachtasdebates.oireachtas.ie/debates%20authoring/debateswebpack.nsf/takes/dail1919012100002|title=Prelude|date=21 JanuaryIonawr 1919|work=First Dáil proceedings|publisher=Oireachtas |nopp=Y |pages=c.9 |quote=Tháinig na Teachtaí I gceann a chéile I nÁrus Árd-Mhéire Bhaile Átha Cliath ar a 3.30 iar nóin.|language=Irish|accessdate=21 October 2016}}</ref> Parhaodd y term i gael ei ddefnyddio ar ôl y Dáil Cyntaf hwn ac fe'i defnyddiwyd i gyfeirio at aelodau drachefn gan aelodau Dáil Éireann (neu "Cynulliad Iwerddon") (1919-22), aelodau o Senedd y Wladwriaeth Rydd (1922-37), ac o'r Dáil Éireann fodern.
