In Welsh mythology, Avalloc was the father of Modron. He may have been the King of Avalon. Welsh mythology, the remnants of the mythology of the pre-Christian Britons, has come down to us in much altered form in medieval Welsh manuscripts such as the Red Book of Hergest, the White Book of Rhydderch, the Book of Aneirin and the Book of Taliesin. ... In Welsh mythology, Modron (divine mother) was a daughter of Avalloc, derived from the Gaul goddess Dea Matrona. ... Avalon (probably from the Celtic word abal: apple; see Etymology below) is a legendary island somewhere in the British Isles, famous for its beautiful apples. ...
Etymology
This theonym appears to be derived from Proto-Celtic *aballo- meaning "apple".[1] The Proto-Celtic language, also called Common Celtic, is the putative ancestor of all the known Celtic languages. ... This article refers to the typographical symbol. ...
References
^ Proto-Celtic—English lexicon and English—Proto-Celtic lexicon. University of Wales Centre for Advanced Welsh and Celtic Studies. (See also this page for background and disclaimers.) Cf. also the University of Leiden database.