Ben notes: Accepted names in different languages (from Wikipedia) include:

German: Hiltrud von Bayern

French: Hiltrude de Bavière

English: Hiltrud of Bavaria

Italian: Hiltrude di Baviera

Dutch: Hiltrude van Beieren

Breton: Hiltrud Bavaria

Polish: Hiltruda Bawarii

Bulgarian: Хилтруда на Бавария

Since her native land (Bavaria) is German-speaking, I would propose her name be Hiltrud von Bayern.

From the German Wikipedia page on Hiltrude (Bayern):

http://de.wikipedia.org/wiki/Hiltrud_(Bayern)

Hiltrud (* 715; † 754), Herzogin von Bayern, war eine Tochter Karl Martells und dessen erster Gemahlin Chrotrud. Nach dem Tod ihres Vaters (741) floh sie auf Rat ihrer Stiefmutter Swanahilde, der Tochter Theodos II., nach Regensburg, wo sie noch im selben Jahr Herzog Odilo von Bayern heiratete. Ihm gebar sie einen Sohn, den späteren Herzog Tassilo III..

In English:

Hiltrude (715-754), Duchess of Bavaria, was a daughter of Charles Martel and his first wife Chrotrud (Rotrude). After the death of her father (741), she fled on the advice of her stepmother, Swanhilde (daughter of Theodosius II), to Regensburg, where in the same year she married Duke Odilo von Bayern. She gave birth to a son, the future Duke Tassillo III.

According to the Foundation for Medieval Genealogy page on Merovingian nobility:

http://fmg.ac/Projects/MedLands/FRANKSMaiordomi.htm#ChiltrudisMOdiloBavariadied748

CHILTRUDIS [Hiltrude] (-754, bur Hostenhoven, Kloster Gengenbach).

The Continuator of Fredegar names "Chiltrudis" as daughter of Charles "Martel", stating that her "wicked stepmother" incited her to joined Odilo of Bavaria whom she married without the permission of her brothers[180].

After the death of her husband, she was regent in Bavaria for her son Duke Tassilo III.

The Annales Moselleni record the death in 754 of "Hildtrud"[181]. m (741) ODILO Duke of Bavaria [Agilolfinger], son of --- (-18 Jan 748, bur Hostenhoven, Kloster Gengenbach).

His brother-in-law Carloman invaded Bavaria, and Odilo was forced to recognise Frankish suzerainty in 744.

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From the German Wikipedia page on Hiltrude (Bayern):

http://de.wikipedia.org/wiki/Hiltrud_(Bayern)

Hiltrud (* 715; † 754), Herzogin von Bayern, war eine Tochter Karl Martells und dessen erster Gemahlin Chrotrud. Nach dem Tod ihres Vaters (741) floh sie auf Rat ihrer Stiefmutter Swanahilde, der Tochter Theodos II., nach Regensburg, wo sie noch im selben Jahr Herzog Odilo von Bayern heiratete. Ihm gebar sie einen Sohn, den späteren Herzog Tassilo III..

In English:

Hiltrude (715-754), Duchess of Bavaria, was a daughter of Charles Martel and his first wife Chrotrud (Rotrude). After the death of her father (741), she feld on the advice of her stepmother, Swanhilde (daughter of Theodosius II), to Regensburg, where in the same year she married Duke Odilo von Bayern. She gave birth to a son, the future Duke Tassillo III.

According to the Foundation for Medieval Genealogy page on Merovingian nobility:

http://fmg.ac/Projects/MedLands/FRANKSMaiordomi.htm#ChiltrudisMOdiloBavariadied748

CHILTRUDIS [Hiltrude] (-754, bur Hostenhoven, Kloster Gengenbach).

The Continuator of Fredegar names "Chiltrudis" as daughter of Charles "Martel", stating that her "wicked stepmother" incited her to joined Odilo of Bavaria whom she married without the permission of her brothers[180].

After the death of her husband, she was regent in Bavaria for her son Duke Tassilo III.

The Annales Moselleni record the death in 754 of "Hildtrud"[181]. m (741) ODILO Duke of Bavaria [Agilolfinger], son of --- (-18 Jan 748, bur Hostenhoven, Kloster Gengenbach).

His brother-in-law Carloman invaded Bavaria, and Odilo was forced to recognise Frankish suzerainty in 744.