March full moon is thought to have earned its name because of the earthworms that appear this time of year as the soil warms for spring. 

There are quite a few names for the March Moon that speak to the transition from winter to spring. Some refer to the appearance (or reappearance) of certain animals, such as the Eagle Moon, Goose Moon (Algonquin, Cree), or Crow Comes Back Moon (Northern Ojibwe), while others refer to signs of the season:

• The Sugar Moon (Ojibwe) marks the time of year when the sap of sugar maples starts to flow.
• The Wind Strong Moon (Pueblo) refers to the strong windy days that come at this time of year. 
• The Sore Eyes Moon (Dakota, Lakota, Assiniboine) highlights the blinding rays of sunlight that reflect off the melting snow of late winter. 

Specifically, in Christianity, this Moon is known as the Lenten Moon if it is the last full Moon of the winter season (i.e., if it occurs before the spring equinox) or as the Paschal Full Moon if it is the first full Moon of spring (i.e., if it occurs after the spring equinox).