Gracious
Yaniah is a modern American creation, likely formed as a rhythmic variation of the Hebrew name Janae or a feminine elaboration of Yan. It carries the traditional meaning of divine favor common to the John family of names.
Less common today
Yaniah isn't in the latest US Top 1000. It last peaked at #9,072 in 2011.
US births per 5-year period, 1990βpresent (SSA data).