Leoba and
Lioba
Both are variants, coming from the Germanic root
liob/liub, "beloved", according
Vornamen Buch by Friedrich-Wilhelm Weitershaus and
Diccionario de nombres propios by Roberto Faure.
Teilo
About this name, Gilles and Bleuzen du Pontavice (
Prénoms en Bretagne) think that it comes from the Greek
Theos, "God".
Loreto Todd (
Celtic Names for Children) says that it could be related with the Welsh
teilwng, "worthy".
But Sir John Rhys thought that Teilo was derivated from
Eliau or
Eilliau (I didn't find etymology for this name):
"Sir John Rhys thinks that his true name [St. Teilo's name] was Eliau or Eilliau; in Latin it usually appears as Teliarus, in Breton as Teliau, and in French as Télo."
Catholic Encyclopediahttp://www.newadvent.org/cathen/14473b.htm
"Teliau, "St. Teilo," from Eliau which is an independent name: Teliau occurs with a number more in the Liber Landavensis, such as Tidiuc, Tilull, Timoi, Tipallai, Tissoi, and others."
The Inscriptions and Language of the Northern Picts by John Rhys
http://www.tarbat-discovery.co.uk/Learning%20Files/THE%20INSCRIPTIONS%20AND%20LANGUAGE%20OF%20THE%20NORTHERN%20PICTS..pdf
Lumia
http://onomastica.mailcatala.com