Second half of 1965 On Tolkien’s behalf and from his dictation, Baillie Knapheis writes a letter to a reader about The Lord of the Rings, reporting inter alia that the name of Merry’s wife was not recorded. Tolkien, however, in an added manuscript note, says that he ‘believes’ that Merry had married a sister of Fredegar Bolger, and will look into the matter (see The Peoples of Middle-earth, p. 117, n. 1."
Baillie Knapheis was Tolkien's secretary in 1965 and subsequently married Christopher Tolkien.
As far as I can tell this is the letter referred to on page 634.
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