Felix is Latin for fortunate or happy, and unlike many names built on virtue or lineage, it simply names a condition -- good luck, freely stated rather than earned through effort. The name carries a lightness that other classical names, built on duty or strength, tend to lack.
Saturn should be asked for limitation of movements, hiding of secrets, impoverishment of countries, decrease of intentions, temptation of souls and water stagnation. - Picatrix (Andalusia, ~1000.AD)