In olden times the English people— for it did not seem fitting to me that I should speak of other nations' observance of the year and yet be silent about my own nation's— calculated their months according to the course of the Moon. Hence, after the manner of the Hebrews and the Greeks, [the months] take their name from the Moon, for the moon is called mona and each month monath.The first month, which the Latins call January, is Giuli; February is called Sol-monath; March, Hreth-monath; April, Eostur-monath ...
Bede writes the month was "named from their goddess Hretha, whom they sacrificed to in that month". Hretha signifies "fame", and Hrethel, or Hreðel was the king of the Geats, in Beowulf. Such a name for a warrior is very widespread among European peoples: cf. for example the Greek name Etiocles.