Explainer / Tanakh
Isaiah 9:6
For to us a child is born, to us a son is given; and the government shall be upon his shoulder: and his name shall be called Wonderful, Counselor, Mighty God, Everlasting Father, Prince of Peace.
כִּי־יֶלֶד יֻלַּד־לָנוּ בֵּן נִתַּן־לָנוּ וַתְּהִי הַמִּשְׂרָה עַל־שִׁכְמוֹ וַיִּקְרָא שְׁמוֹ פֶּלֶא יוֹעֵץ אֵל גִּבּוֹר אֲבִי־עַד שַׂר־שָׁלוֹם
We kept the ASV's wording, in modern English: "Wonderful, Counselor, Mighty God, Everlasting Father, Prince of Peace."
Why
"His name shall be called."
וַיִּקְרָא שְׁמוֹ is "and one called his name." The verb is active, with no subject named, and English renders such a verb with the passive.
אֵל גִּבּוֹר, "Mighty God."
אֵל is "God," and גִּבּוֹר is "mighty one, warrior." The same phrase is used of Yehovah in the next chapter (10:21).
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The plural אֵלֵי גִבּוֹרִים is used of mighty leaders in Ezek 32:21.
אֲבִי־עַד, "Everlasting Father."
The words are "father of eternity." In Hebrew, "father of" can mean the one who has or begins a thing (Gen 4:20–21: Jabal, "the father of such as dwell in tents").
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"Everlasting Father" carries the two words in English order.
Sentence names
Hebrew names are often short statements: Isaiah's own son is named Maher-shalal-hash-baz (8:3).
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The Hebrew has no punctuation marking where each part of this name begins and ends; the ASV divides it into five parts.
"Wonderful, Counsellor, Mighty God, Everlasting Father, Prince of Peace" (ASV); "The Mighty God is planning grace; the Eternal Father, a peaceable ruler" (JPS).