A ceasg is a mermaid in Scottish mythology, a supernatural half-woman and half-grilse (salmon). It is also known in Scottish Gaelic as maighdean na tuinne ("maid of the wave") or maighdean mhara ("maid of the sea"). The ceasg is said to be able to grant three wishes to anyone that captures her
Banshee The banshee (from Irish: bean sí woman of the sídhe" or woman of the fairy mounds") is a female spirit in Irish mythology, usually seen as an omen of death and a messenger from the Otherworld. In legend, a banshee is a fairy woman who begins to wail if someone is about to die. In Scottish Gaelic mythology, she is known as the bean sìth or bean-nighe and is seen washing the blood stained clothes or armour of those who are about to die.
In Irish and Scottish mythology, the Cailleach is a hag goddess concerned with creation, harvest, the weather and sovereignty. In partnership with the goddess Brigid, she is a seasonal goddess, seen as ruling the autumn and winter months while Brigid rules the spring and summer. § Illustration: Cailleach by Mairin-Taj Caya
Beltane - meaning 'bright fire' in Gaelic - (or Beltaine)(Bealtaine - Modern Irish)(Bealltainn - Scottish Gaelic) is is a time for fertility magic. Couples dancing around the May Pole, with strong ale flowing, have long been a May Day tradition. http://www.cloudsonline.co.uk/horned-green-man-beltane-wall-plaque-815-p.asp
"Daughter of the Sea". Selkies are mythological creatures found in Faroese, Icelandic, Irish, and Scottish folklore. They are said to live as seals in the sea but shed their skin to become human on land. The legend apparently originated on the Orkney and Shetland Islands and is very similar to those of swan maidens.