Despite this, Keay and Keay (1994) and Haswell-Smith (2004) suggest the Gaelic name is derived instead from "Gjáey", meaning "island of the geo" or "cleft". However, Norse "gjá" normally shows up in Gaelic in the form of "geodha". Czerkawaska (2006) also notes that the isle is called "Gug" in a charter of 1309 and also appears as "Gega" on some old maps and speculates that a possible pre-Norse derivation is from the Gaelic "Sheela na Gig", a female fertility symbol. Haswell-Smith (2004) also offers the possibility of "Gydha's isle" after the Norse female name.