A diminutive of Valeria, which comes from a Latin name meaning “strength.” And trust, she’ll have the strength of a grown-ass woman when she’s trying to resist your efforts to brush her hair.
There's not much shortening Lera.
Famous people named Lera:
Singer/songwriter Lera Lynn; cognitive scientist Lera Boroditsky.
"Lera" also means "clay" in Swedish.