Some hold that the Beguine movement which came to light in the 12th century was actually founded by St Begga; and the church in the beguinage of Lier, Belgium, has a statue of St Begga standing above the inscription: St. Begga, our foundress. The Lier beguinage dates from the 13th century.
Another popular theory, however, claims that the Beguines derived their name from that of the priest Lambert le Bègue, under whose protection the witness and ministry of the Beguines flourished.[5][6]
Baix, F. "Begge," in Dictionnaire d'histoire et de géographie ecclésiastiques, VII, ed. A. Baudrillart (Paris, 1934), cols. 441-48
Heller, J., ed. Genealogiae ducum Brabantiae (Monumenta Germaniae Historica; SS, XXV), pp. 385–413, ref Genealogia ampliata, 1270
Rousseau, Félix. "Le monastère mérovingien d'Andenne", À travers l'histoire de Namur, du Namurois et de la Wallonie. Recueil d'articles de Félix Rousseau (n.p., 1977), pp. 279–313