I am searching any information on Nelke and Francks from Latvia

In particularly of:

Julius Franck

Harry Franck

and

Wallis/Wally/Vally Nelke

Does anyone know of a Wallis/Wally/Vally Nelke who lived in Latvia and emigrated with her husband and son to America ?

Furthermore, does anyone have information on the name Franck, particularly of those who lived in Latvia ?

Thank you

Vanessa