In the dead of the night there was a fearful caterwauling; some grimalkin was uncivil to her; then there was a scramble, then a clapper-clawing; then both parties rolled off the roof and tumbled from a great height among the trees on the hillside.
-- Washington Irving, Tales of the Alhambra, 1832
I have never felt more comfortable in my spirit. I had no thought of you until my Grimalkin mewed at my window, and to admit him I had need to face the garden where we…
-- Rebecca West, Harriet Hume, 1929
Grimalkin is apparently an alteration of the words gray and malkin, which is a diminutive form of the name Maud.