What is the most likely reason Tolkien and his friends called their group the inklings

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The Inklings were an informal literary circle in Oxford that began meeting in the early 1930s and continued until the late 1940s. The nucleus of the group seemed to be C. S. Lewis and J. R. R. Tolkien, who noted that Lewis took particular pleasure in listening to others read their works aloud. (Tolkien added that Lewis had phenomenal memory for texts that he received in this way, and could quote verbatim from books he had heard a decade or two earlier.)

Lewis and Tolkien invited like-minded spirits to join them for informal, convivial meetings in Oxford pubs, later adding evening gatherings to read their works aloud, receiving both praise and candid criticism. Gradually, the schedule of Inklings meetings became regularized, so they generally met on Tuesday mornings at the "Eagle and Child" (which they called the "Bird and Baby" or just the "Bird") and at Lewis’s rooms in Magdalen College on Thursday evenings. Besides Lewis and Tolkien, the third most prominent member of the Inklings was Charles Williams, an editor at Oxford University Press, who began attending meetings when the Press moved from London to Oxford during World War II. Other regular members of the Inklings included Lewis’s brother, Warren Hamilton Lewis, Victor "Hugo" Dyson, Adam Fox, Lord David Cecil, Neville Coghill, Owen Barfield, Robert "Humphrey" Havard, Gervase Mathew, and Commander James Dundas-Grant.

Warren Lewis noted that the Inklings were an informal circle of friends, not an organized club or literary society, adding that there were no officers, agendas, or minutes taken. Apart from the regulars, an Inklings meeting might also include Colin Hardie, Christopher Tolkien (J. R. R. Tolkien’s son), Roger Lancelyn Green, Percy Bates, Ronald McCallum, Charles Wrenn, or other visitors who had been invited (and pre-approved) by established members of the group. The golden years of the Inklings seem to have been from the late 1930s to the mid-1940s, when the group heard J. R. R. Tolkien’s Lord of the Rings read aloud, as well as C. S. Lewis’s Out of the Silent Planet and Perelandra, and Charles Williams’ All Hallows Eve.

The name "Inklings" itself is a bit of whimsy, a pun on those who dabble in ink-writers--and those who may only have an inkling of what they intend to write about when they begin a project. (For the many Christians in the group, the name may have also suggested certain "inklings" of immortality, their assurance of things hoped for and conviction of things unseen.) The name "Inklings" was not original with Lewis, Tolkien, and their friends; they borrowed the term from an undergraduate literary society that flourished briefly in the early 1930s.

Tolkien based summed up the spirit of Inklings meetings when he called it "a feast of reason and flow of soul" (Letters, 102).