כְּרֵתִי Kᵉrêthîy (H3774)

a Kerethite or life-guardsman

Cherethites = "executioners" 1) a group of foreign mercenary soldiers serving as a bodyguard for king David; also executioners 2) either Cretans or proto-Philistines (in general)

probably from כָּרַת (H3772) in the sense of executioner; (compare טַבָּח (H2876)) (only collectively in the singular as plural)