Defender of mankind
Alexiah is a modern elaboration of Alexia, which is the feminine form of Alexis. It ultimately derives from the Greek verb 'alexein', meaning to defend or protect. The addition of the 'h' suffix gives it a contemporary, stylized flair common in American naming trends.
Less common today
Alexiah isn't in the latest US Top 1000. It last peaked at #3,667 in 2006.
US births per 5-year period, 1990βpresent (SSA data).