Amaiah is usually treated as a variant of Amaia, a Spanish place name associated with "the end" or a high place.
Amaiah weaves together threads from both Hebrew scripture and Basque geography, existing at the crossroads of two entirely separate etymological traditions. In its Hebrew form, Amaiah (also rendered Amaziah) appears in the Old Testament as a royal name meaning "Yahweh is mighty" or "the Lord bears" — carried most notably by Amaziah, king of Judah, who ruled in the 9th century BCE and whose story is recorded in 2 Kings and 2 Chronicles. The name expresses theological trust, the belief that divine strength undergirds human existence.
This strand gives Amaiah an ancient, scriptural gravity. Separately, the phonetically similar Amaia (pronounced ah-MY-ah) is a distinctly Basque name from the Iberian Peninsula, meaning "the end" or "the last," and was immortalized by Navarro Villoslada's 1879 historical novel Amaia, la hija de Haroa, which brought it to widespread Basque cultural consciousness. In Basque tradition it refers to the last-born child or the final one — a tender designation.
This form has experienced a remarkable revival in Spain and France's Basque Country and gained international notice when Amaia Romero won Spain's Operación Triunfo in 2017. The Amaiah spelling popular in English-speaking countries today tends to blend these two traditions in parents' minds — retaining the Hebrew gravitas while adopting the Basque melodicism. The name's open vowel sounds give it a flowing, lyrical quality, and its rarity outside specific communities makes it feel distinctive without being opaque.