From an unused root meaning to be lonely; a bereaved person -- fatherless (child), orphan.
H3490. yathom
יָתוֺם noun [masculine] orphan (Late Hebrew id.; Aramaic יַתְמָא, ; Phoenician יתם; Arabic pupil, orphan) — יָתוֺם Exodus 22:21 29t.; plural יְתוֺמִים 22:23 8t.; suffix יְתֹמֶיךָ Jeremiah 49:11; יְתֹמָיו Isaiah 9:16; לִיתוֺמָיו Psalm 109:12; — orphan, i.e. fatherless ("" אַלְמָנָה) Exodus 22:23; Psalm 109:9; Lamentations 5:3 ("" אָב אַין); Job 24:9; Psalm 109:12; probably also Exodus 22:21; Deuteronomy 10:18; 14:29; 16:11, 14; 24:17, 19, 20, 21; 26:12-13, 27:19; Psalm 94:6; 146:9; Jeremiah 7:6; 22:3; Zechariah 7:10; Malachi 3:5 (in all these, mentioned as helpless, exposed to injury, "" אַלְמָנָה and גֵּר); similarly, "" אַלְמָנָה Job 22:9; 24:3; 29:12; 31:17; Psalm 68:6; Isaiah 1:17, 23; 9:16; 10:2; Jeremiah 49:11; Ezekiel 22:7; without אלמנה Hosea 14:4; Job 6:27; 31:21; Psalm 10:14; 10:18; Proverbs 23:10; Jeremiah 5:28 (in no case clear that both parents are dead).