Defender of mankind
Alexsys is a modern creative spelling of Alexis. It derives from the Greek verb 'alexein', which means to ward off or defend, historically used as a title for protectors.
Less common today
Alexsys isn't in the latest US Top 1000. It last peaked at #7,586 in 1999.
US births per 5-year period, 1990βpresent (SSA data).