Ilya

Ilya begins in Hebrew, in the name Eliyahu, and it makes a plain claim: my God is Yahweh. The Hebrews called their prophet Eliyahu, whom English readers know as Elijah. When that name moved east into Slavic speech, it settled as Ilya, and it kept a Russian coloring that has held for centuries.

Russian folklore handed the name its most famous bearer. Ilya Muromets, a bogatyr of the old byliny, was a peasant strongman said to have lain bedridden for years before he rose, mounted a horse, and rode to defend Kyiv. Orthodox tradition blurred him with the prophet himself, so that thunder over the summer fields was Ilya crossing the sky in his chariot. The story stuck.

In Poland the spelling stays close to its source, Ilya or Ilja. A school register might set it beside the Jakub and Michał entries, one Hebrew line among the rest. The meaning under it does not move: my God is Yahweh.