- ELLIS, EDWARD (1842? - 1892), Baptist minister, soldier, and editor of a Baptist newspaper in U.S.A.
- ELLIS, EDWARD LEWIS (1922 - 2008), historian and biographer
- ELLIS, ELLIS ab (fl. 1685-1726), cleric and poet
- ELLIS, ELLIS OWEN (Ellis Bryn-coch; 1813 - 1861), artist
- ELLIS, GRIFFITH (1844 - 1913), Calvinistic Methodist minister
- ELLIS, HUW (1714 - 1774), harpist
- ELLIS, JOHN (d. 1665), cleric and quasi-Puritan
- ELLIS, JOHN (1760 - 1839), saddler and musician
- ELLIS, JOHN (1674 - 1735), cleric and antiquary
- ELLIS, JOHN GRIFFITH (1723/4 - 1805), Methodist exhorter
- ELLIS, LEWIS (1761 - 1823), musician
- ELLIS, MEGAN - see EAMES, WILLIAM
- ELLIS, MORGAN ALBERT (1832 - 1901), Welsh-American preacher and editor
- ELLIS, PHILIP CONSTABLE (1822 - 1900), cleric
- ELLIS, REES (fl. 1714), bard
- ELLIS, RICHARD (1865 - 1928), librarian and bibliographer
- ELLIS, RICHARD (1784 - 1824), excise officer and musician
- ELLIS, RICHARD (1775 - 1855), musician
- ELLIS, ROBERT (Cynddelw; 1812 - 1875), Baptist minister, preacher, poet, antiquary, and commentator
- ELLIS, ROBERT (1808 - 1881), Calvinistic Methodist minister
- ELLIS, ROBERT (Llyfnwy; 1805 - 1872), parish clerk (1829-72) and poet
- ELLIS, ROBERT (1817 - 1893), musician
- ELLIS, ROBERT - see ELLICE, ROBERT
- ELLIS, ROBERT MORTON STANLEY (1898 - 1966), minister (Presb.), and author
- ELLIS, ROWLAND (1650 - 1731), Welsh-American Quaker
- ELLIS, ROWLAND (1841 - 1911) Orkney, bishop
- ELLIS, ROWLAND, schoolmaster in the U.S.A. - see ELLIS, ROWLAND
- ELLIS, SAMUEL (1803 - 1852), engineer
- ELLIS, TECWYN (1918 - 2012), educationalist, scholar and author
- ELLIS, THOMAS (1711/12 - 1792), cleric
- ELLIS, THOMAS (1625 - 1673), cleric and antiquary
- ELLIS, THOMAS (c. 1819 - 1856), Orientalist
- ELLIS, THOMAS (fl. 1824), poet
- ELLIS, THOMAS EDWARD (1859 - 1899), M.P. for Merioneth (1886-99) and chief Liberal whip (1894-5)
- ELLIS, THOMAS EVELYN SCOTT - see SCOTT-ELLIS, THOMAS EVELYN
- ELLIS, THOMAS IORWERTH (1899 - 1970), educationalist and author
- ELLIS, THOMAS PETER (1873 - 1936), judge (I.C.S.) and authority on Punjab customary law and medieval Welsh law
- ELLIS, WILLIAM (Gwilym ab Elis; 1752 - 1810), hymn-writer and balladist
- ELLIS-GRIFFITH, Sir ELLIS (JONES) (1860 - 1926), barrister and M.P.
- ELPHIN - see GRIFFITH, ROBERT ARTHUR
- ELSTAN (or ELYSTAN) GLODRYDD, founder of the fifth of the 'royal tribes' of Wales
- ELWYN-EDWARDS, DILYS (1918 - 2012), composer
- ELYSTAN GLODRYDD - see ELSTAN GLODRYDD
- EMANUEL, HYWEL DAVID (1921 - 1970), librarian and Medieval Latin scholar
- EMERY, FRANK VIVIAN (1930 - 1987), historical geographer
- EMMANUEL, IVOR LEWIS (1927 - 2007), singer and actor
- EMRYS - see AMBROSE, WILLIAM
- EMRYS ab IWAN - see JONES, ROBERT AMBROSE
- EMRYS ap IWAN - see JONES, ROBERT AMBROSE
- EMRYS-ROBERTS, EDWARD (1878 - 1924), first professor of pathology and bacteriology at the Welsh National School of Medicine