A stylized form of Claire, from Latin clarus meaning clear or bright.
Clairah is a stylized form of Claire, and its root is the Latin clarus, meaning clear or bright. That meaning has always given the Claire family a sense of light, intelligibility, and simple purity.
The added spelling gives Clairah a more decorative, contemporary edge without losing the classical polish of the original. It feels gentle but not plain, familiar but customized. That makes it appealing to people who want a name with built-in clarity and a slightly softer modern finish.