The 'Star Trek' character is named after Texas Guinan (1884-1933), an American actress & entrepreneur of Irish descent.According to House of Names "The surname Guinan comes from the Irish surname O Cuanain (O'Conein and MacConein) and is derived from the Irish Cuinin for "rabbit", son of Dugal. They claim descendancy through the Donnelly line of the native Irish." This would make Guinan related to Conan. https://www.houseofnames.com/guinan-family-crest
According to House of Names "The surname Guinan comes from the Irish surname O Cuanain (O'Conein and MacConein) and is derived from the Irish Cuinin for "rabbit", son of Dugal. They claim descendancy through the Donnelly line of the native Irish." This would make Guinan related to Conan.
https://www.houseofnames.com/guinan-family-crest