Around Clement of Alexandria he disccuses dating in (Stromateis 1.21.144-146):

Yule started out as a month name. In the Germanic calendar, the two months on either side of each solstice had the same name: so the months on either side of the summer solstice were called litha, or alternatively ‘former litha’ and ‘latter litha’, and the months on either side of the winter solstice were…

Tying the fourth day or creation – Genesis 1:14-19 – to increasing daylight hours to the spring equinox: specifically to the 4th day after the spring equinox. (Susan K. Roll, Towards the Origins of Christmas Kampen, Kok Pharos Publishing, 1995: p.64)

For Eostre: Philip A. Shaw has given a full discussion of this subject in Pagan Goddesses in the Early Germanic World: Eostre, Hreda and the Cult of Matrons (Bloomsbury, 2011) and mentions further onomastic evidence that Eostre was a Germanic goddess, including place names in England including Eastry in Kent (which was attested in the…