Judges 13:18

Why askest thou? Jacob, after recognizing that the one with whom he had been wrestling was a heavenly visitant, had asked the Angel His name and received no reply (Gen. 32:29). Again this Angel (see on v. 3) refused to identify Himself, this time to Manoah. In contrast, Gabriel identified himself by name to Zacharias (Luke 1:19).

Secret. The Heb. pel’i is an adjective meaning “wonderful.” The noun form of the same word is translated “Wonderful” in Isa. 9:6 (see also Ex. 15:11; Isa. 25:1; 29:14; etc.). The word denotes something extraordinary, ineffable, beyond human understanding. The best illustration of the meaning of this word is the way it is used in Ps. 139:6: “Such knowledge is too wonderful for me; it is high, I cannot attain unto it.” The verb is used in the sense of “surpassing understanding” (see Job 42:3; Ps. 131:1; Prov. 30:18). It is probably because of this meaning of the word that the translators of the KJV rendered it here as “secret.” What is evidently meant is not that the name of the Angel was “Secret” or “Wonderful,” but that His name was beyond Manoah’s power to understand.