He seems to have converted two of his four surnames into forenames.
This genealogy should explain where the four surnames come from:
Sir Henry FAIRFAX, cr Baronet 1836 (3 Feb 1790-3 Feb 1860); m.1st Jan 1830 Archibald Montgomerie (d.13 Jul 1844), dau and heiress of Thomas Williamson, later Williamson-Ramsay, of Lixmount, by Elizabeth, dau and coheir of Robert Ramsay of Camno and Arthurstown; m.2nd 19 Dec 1851 Sarah Astell (dsp 23 Jun 1879)
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Sir William George Herbert, 1876 RAMSAY-FAIRFAX, 2nd Bt. (15 Mar 1831-19 Jan 1902); m.17 Sep 1868 Mary Ann Pawson Hargrave Pawson (d.1 Sep 1924)
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Sir Henry William, 1892 RAMSAY-FAIRFAX-LUCY, 1921 CAMERON-RAMSAY-FAIRFAX-LUCY, 3rd Bt. (25 Sep 1870-20 Aug 1944); m.1st 26 Jul 1892 Ada Christina (d.17 Dec 1943), dau and heiress of Henry Spencer Lucy, of Charlecote, by a gdau of Sir Duncan Cameron, 2nd Bt.; m.2nd 5 Aug 1944 Norah Mackenzie
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Ewen Aylmer Robert (31 Dec 1899-12 Jul 1969); m.4 Mar 1930 Margaret Westall (d.1994), dau of Sir John Westall King, 2nd Bt.
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Duncan (18 Sep 1932-8 Mar 2025); m.26 Sep 1964 Janet Barclay Niven (d.11 Jan 2017)