What is the meaning of Wau?

Digamma (Ϝ/ϝ).

garden

Alternative form of wawe

wau (archaic Greek letter)

woof (sound of a dog)

waw (letter of the Arabic alphabet)

Alternative form of au

kite (flying toy on string)

Romanization of ꦮꦲꦸ

kite (flying toy on string)

The name of the twenty-seventh letter of the Arabic alphabet: و

The name of the thirtieth letter of the Malay alphabet, written in Arabic script: و

a Mother Hubbard dress

the sound /w/ (labiovelar approximant) or /u̯/ (non-syllabic /u/)

Source: wiktionary.org