Prune is a fruit name loved by the French, for whom it's a Plum equivalent. In the U.S., Plum works, but Prune is not a name we'd want to inflict on a child. Prunella is slightly more plausible.

Pronounced Beecham, but still too fancy and fey. Likewise Beaufort (beautiful fort), Beaufoy (beautiful beech tree), and Beaumont (beautiful mountain).

French saintly name, used for both boys and girls. Although not common in France, it has been used in small numbers for boys in the 2010s and 2020s. Candide, in its sense as the French word for "naive", was the title character of a satirical novel by Voltaire.

This could be a fresh way to honor an ancestral Walter.

For remembrance of books past, Proust might be a meaningful middle name.

A happy combination of several desirable genres: it's a word name, it has a foreign accent, and it has a highly virtuous meaning. And few other parents will be bold enough to choose it.