Names with "damp" in Meaning

Chao m & f Chinese
From Chinese 超 (chāo) meaning "surpass, leap over" (which is usually only masculine), 潮 (cháo) meaning "tide, flow, damp", or other characters that are pronounced similarly.

Nechtan m Irish Mythology, Old Irish
Irish name of uncertain meaning, possibly from a Celtic root meaning "damp" (cognate with Neptune). In Irish mythology Nechtan was the husband of Boann, the goddess of the River Boyne. He is sometimes identified with Nuada. This name was borne by the 5th-century Saint Nectan of Hartland in Devon, who was supposedly born in Ireland. It was also the name of several kings of the Picts (described mostly from Gaelic sources, this may represent a Pictish cognate).

Neptune m Roman Mythology (Anglicized)
From the Latin Neptunus, which is of unknown meaning, possibly related to the Indo-European root *nebh- "wet, damp, clouds". Neptune was the god of the sea in Roman mythology, approximately equivalent to the Greek god Poseidon. This is also the name of the eighth planet in the solar system.