champion. Hebrew. 'ish-habbenayivl = "the man between the two [hosts]", or, the duellist. This accords with the subscription of Psa 8 (see note there)
Muth-labben = the death of the man between; i.e. the death of the champion (Goliath) which Psa 8 celebrates. Psa 144, which has the same words, "What is man" has for its title in Septuagint. "A Psalm of David concerning Goliath"(compare 1Sa_8:4 with Psa_144:3). See 1Sa_17:23.
six. Note this number "6" stamped like a "hallmark" on this "man" (as on Nebuchadnezzar, Dan 3) Compare the six pieces of armour, verses: 1Sa_17:5-7.