From German treu, meaning faithful, loyal, or true.
Treu is a German adjective of considerable moral beauty, meaning 'faithful,' 'loyal,' 'true,' and 'devoted.' It derives from Old High German 'triuwi' and shares an ancient Germanic root with the English 'true,' the Dutch 'trouw,' and the Old Norse 'tryggr' — all expressing the same bedrock virtue of steadfast reliability. In German, 'treu' appears in the opening lines of the national anthem ('Einigkeit und Recht und Freiheit' — Unity, Justice, and Freedom), in proverbs, in countless family mottos, and in compound words like 'Treue' (fidelity, loyalty) that anchor the language's moral vocabulary.
As a given name, Treu is highly unusual — it has functioned historically far more as a surname or descriptive epithet than as a first name. Several notable German and Swiss families bear Treu as a surname, and in heraldry and civic naming the word appears as a virtue-marker. Its use as a given name most likely reflects the broader contemporary fashion for virtue names — True, Loyal, and their variants — that has taken hold across English-speaking naming culture in recent years, with parents of German heritage occasionally reaching for the native-language form as a more personal, rooted alternative to the English 'True.'
Treu is spare and strong — one syllable, four letters, a complete ethical statement. Bearers of the name carry something unusual: a word so plainly and directly meaningful in its origin language that its weight is never entirely lost, even across translation. To be Treu is to be named for the quality parents most hope to instill.