Since the family is not in modern British genealogical works, I post the genealogy I have. Most of the family wound up in Britain and used the form “de Bunsen”. There were also some early marriages to German nobles.
Christian Karl Josias Bunsen, 1858 von Bunsen and [ad personam] Frhr von Bunsen (25 Aug 1791-Bonn 28 Nov 1860); m.1817 Frances Waddington (4 Mar 1791-Karlsruhe 23 Apr 1876), dau of Benjamin W by Georgina Marianne Port, said to be part of the Granville family
1.Rev. Heinrich Georg (1818-19 Mar 1885); not listed as married in the Briefadelige genealogies, but marriage shown in LG; m.Apr 1847 Mary Louisa Harford (1821 [1822?]-1906)
1.1.Hilda Elizabeth (1849- )
2.Ernst Christian Louis (1819-1903); m.1845 Elizabeth Sheppard Gurney (1817-1903)
2.1.son (1846- )
2.2.William Ernest (1847-1848)
2.3.Hilda (1848-1932); m.1st 1870 Hugo von Krause (d.1871); m.2nd 1877 Adolph Frhr von Deichmann (d.1907)
2.4.Sir Maurice William Ernest, Bt (1852-1932); m.1899 [Dame] Berta Mary Lowry-Corry (d.1954)
2.4.1.Hilda Violet Helena (1900- ); m.1st 1921 Richard Guy Cecil Yerburgh (d.1926); m.2nd 1931 Sir Arthur Guy Salisbury-Jones (d.1985)
2.4.2.Cicely Elizabeth (1902- ); m.1927 Archibald Vivian Campbell Douglas
2.4.3.Rosalind Margaret (1903-1968)
2.4.4.Mary Berta (1910-1982)
2.5.Marie (1853-1925)
3.Karl (1821-1887); m.1856 Marie Waddington (1833-1912)
3.1.Beatrice (1861- ); m.1895 Charles Loftus Uniacke Townshend, of Castle Townshend
4.Georg (1824-1896); m.1854 Emma Birkbeck (1829-1899)
4.1.Karl Christian Richard (1856-1890); note birth date of 24 Dec 1856 confirmed by Times announcement 27 Dec 1856; Briefadelige genealogy has him born 24 Dec 1857
4.2.Lothar Henry George (1858-1950); m.1st May Kinloch (d.1898), dau of Sir Alexander Kinloch, 10th Bt.; m.2nd 1904 Victoria Alexandrina Buxton (1874-1953)
4.2.1.Arnold George (1887-1972); m.1919 Helen Catherine Sophia Tennyson-d’Eyncourt
4.2.1.1.Anne de Bunsen, b.1 Dec 1921; m.1st London 17 Apr 1940 Nicholas Edwin Pease; m.2nd 31 Jul 1963 Richard S Longman
4.2.1.2.Elizabeth de Bunsen (3 Apr 1923-1997)
4.2.1.3.Richenda Imogen de Bunsen (1 Aug 1939-9 Jan 2021); m.1964 Thomas van Laun
4.2.2.Eric Henry (1889-1942); m.1929 Kathleen L I Bloomfield
4.2.3.Charles (1905-1969); m.1932 Margaret Babington Smith (d.1997)
4.2.3.1.Peter Noel, b.1935; m.1965 Hon. Alexandra Carrington
4.2.3.1.1.Victoria
4.2.3.1.2.Charles (1970-2022)
4.2.3.2.Bridget (1937- ); m.1958 John J Buxton (d.2014)
4.2.3.3.Michael (1937- )
4.2.3.4.J.Maurice; engaged 1971 to Josefina A Schröder --> issue
4.2.4.Sir Bernard (1907-1990); m.[engaged 1975] Joan Hamston (d.2000)
4.2.5.Ronald Lothar (1910-1992); m.[engaged 1941] Margaret Forester Cochrane (1912-1989)
4.2.5.1.Margaret G; engaged 1975 to William W Wilson
4.2.5.2.Emma; engaged 1971 to David Henry Salter
4.2.5.3.Helen F; engaged 1972 to Michael J Hynes
4.3.Marie (1862- )
4.4.Berta (1863- ); m.1890 Ernest Henderson
4.5.Else (1866- )
4.6.Emma (1867-1939)
4.7.Hildegard (1869- )
4.8.Waldemar (1872- ); m.1903 Mia Fleischhammer (1877- )
5.Franziska “Frances” (1826-1894)
6.Marie (182_-17 Feb 1919); m.1850 John Battersby Harford (29 Nov 1819-11 Feb 1875) [Harford-Battersby]
7.Emilie (1827-1911)
8.Theodor (1832-1892); m.1st 1876 Nora Hill (1858-1883); m.2nd 1885 Therese Freiin von Buseck (1841-1912)
8.1.Harald (1877- )
8.2.Moritz (1881- )
9.Theodora Maria Wilhelmine (1832-1862); m.1855 August Freiherr von Ungern-Sternberg (d.1895)
10.Mathilde (1837-1867)