- WILLIAMS, DAVID CHRISTMAS (1871 - 1926), musician
- WILLIAMS, DAVID DAVID (1862 - 1938), minister (Presb.) and author
- WILLIAMS, DAVID EWART PARRY - see PARRY-WILLIAMS, DAVID EWART
- WILLIAMS, DAVID JAMES (1870 - 1951), schoolmaster
- WILLIAMS, DAVID JAMES (1897 - 1972), Labour politician
- WILLIAMS, DAVID JOHN (1885 - 1970), writer
- WILLIAMS, DAVID JOHN (1886 - 1950), schoolmaster and author
- WILLIAMS, DAVID LLEWELYN (1870 - 1949), surgeon
- WILLIAMS, DAVID MATTHEW (Ieuan Griffiths; 1900 - 1970), scientist, dramatist and inspector of schools
- WILLIAMS, DAVID PRYSE (Brythonydd; 1878 - 1952), minister (B), writer, and historian
- WILLIAMS, DAVID REES (1st BARON OGMORE), (1903 - 1976), politician and lawyer
- WILLIAMS, EDMUND (1717 - 1742), early hymnist of the Methodist revival
- WILLIAMS, EDWARD (Iolo Morganwg; 1747 - 1826), poet and antiquary
- WILLIAMS, EDWARD (1750 - 1813), Independent divine and tutor
- WILLIAMS, EDWARD (1826 - 1886), iron-master
- WILLIAMS, EDWARD (1818 - 1880), Independent minister
- WILLIAMS, Sir EDWARD JOHN (1890 - 1963), politician
- WILLIAMS, Sir EDWARD VAUGHAN (1797 - 1875), barrister - see WILLIAMS, JOHN
- WILLIAMS, ELIEZER (1754 - 1820), cleric, author, and schoolmaster
- WILLIAMS, ELISEUS (Eifion Wyn; 1867 - 1926), poet
- WILLIAMS, ELIZABETH HELEN (1838 - 1910), author - see ROWLAND, THOMAS
- WILLIAMS, ERNEST LLWYD (1906 - 1960), minister (B), poet and writer
- WILLIAMS, EVAN (1749 - 1835), bookseller and publisher
- WILLIAMS, EVAN (1706 - ?), harpist
- WILLIAMS, EVAN (1719 - 1748), Congregational minister and revivalist
- WILLIAMS, EVAN (1816? - 1878), Calvinistic Methodist minister, and artist
- WILLIAMS, EVAN (1724 - 1758), Welsh Moravian
- WILLIAMS, Sir EVAN (1871 - 1959), BARONET and colliery owner
- WILLIAMS, EVAN JAMES (1903 - 1945), physicist
- WILLIAMS, EVAN JAMES (1903 - 1945), scientist
- WILLIAMS, FOULK ROBERT (Eos Llyfnwy; 1774 - 1870), musician
- WILLIAMS, FRANCES (FANNY) (?1760 - c.1801), convict and Australian settler
- WILLIAMS, FREDERICK GEORGE ROBERTSON (d. 1945), landowner - see WILLIAMS, ALICE MATILDA LANGLAND
- WILLIAMS, GARETH WYN (Baron Williams of Mostyn), (1941 - 2003), lawyer and politician
- WILLIAMS, GEORGE (1879 - 1951), company director and Lord Mayor of Cardiff
- WILLIAMS, Sir GEORGE CLARK (1878 - 1958), BARONET and county court judge
- WILLIAMS, Sir GLANMOR (1920 - 2005), historian
- WILLIAMS, GRACE MARY (1906 - 1977), composer
- WILLIAMS, GRIFFITH (1824 - 1881), Calvinistic Methodist minister, and author
- WILLIAMS, GRIFFITH (1587? - 1673), bishop and author
- WILLIAMS, GRIFFITH (Gutyn Peris; 1769 - 1838), poet
- WILLIAMS, GRIFFITH JOHN (1854 - 1933), schoolmaster, geologist, and antiquary
- WILLIAMS, GRIFFITH JOHN (1892 - 1963), University professor and Welsh scholar
- WILLIAMS, GRIFFITH VAUGHAN (1940 - 2010), journalist and gay activist
- WILLIAMS, GWENFRIDA (d. 1914), author - see WILLIAMS, ALICE MATILDA LANGLAND
- WILLIAMS, GWILYM (1839 - 1906), judge
- WILLIAMS, GWILYM IEUAN (1879 - 1968), minister (Presb.)
- WILLIAMS, GWLADYS MARION GRIFFITH - see EAMES, MARION GRIFFITH
- WILLIAMS, GWLADYS PERRIE - see MORRIS, Sir RHYS HOPKIN
- WILLIAMS, GWYN ALFRED (1925 - 1995), historian and television presenter