It is likely the name is Key. Other variations include Kay, Kaye and Keigh.
Johann Daneal Fick married in Peel and had a son John. Isabelle Rey is recorded as marrying John, whether or not this is the father for a second marriage, or son I don't know but John and Isabelle had 3 sons listed showing the surname of the mother as Key.
She may have come from Patrick but it could be that one of the sons, Samuel, appears in the Patrick burial register as dying 15 May 1840 with the notation " Who hanged himself".

Len Faragher