"Variant of Josiah"
The name Jasiah is commonly a unisex name from the "Hebrew" origin.
Jasiah is a modern English variant of Josiah, the name of a king of Judah in the biblical books of Kings. The variant is formed by changing the vowel of the first syllable while keeping the rest of the name intact. Jasiah first appears in United States birth records in 1991, which fits a recent variant rather than an older inherited form.
Josiah means "God will heal and protect.".
The pronunciation of Jasiah is juh-SY-uh.