From the same as tseba' (in the sense of grasping); something to sieze with, i.e. A finger; by analogy, a toe -- finger, toe.
see HEBREW tseba'
H676. etsba
אֶצְבַּע noun feminineLeviticus 14:6 finger; — ׳א absolute Isaiah 58:9, construct Exodus 8:15 +; suffix אֶצְבָּעוֺ Leviticus 4:6 +; plural אֶצְבָּעוֺת Jeremiah 52:21, construct אֶצְבְּעֹת 2 Samuel 21:20 +, etc.; —
1 finger, especially
a. forefinger, of priest, applying blood (P), Exodus 29:12; Leviticus 4:6, 17, 25 8t.; applying oil 14:16 (twice in verse); 14:27.
b. א ׳שְׁלַח of any one Isaiah 58:9, sign of contempt.
c. of God, as writing Exodus 31:18 (E) Deuteronomy 9:10; = act of God Exodus 8:15 (J).
d. plural of all the fingers 2 Samuel 21:20a; fingers in General Isaiah 2:8; 17:8; 59:3; Psalm 144:1; Proverbs 7:3; Song of Solomon 5:5; of ׳י Psalm 8:4; בְא ׳מֹרֶה Proverbs 6:13 (of contemptuous gesture); as measure of thickness, Jeremiah 52:21 four fingers.
2 toes: רַגְלָיו אֶצְבְּעֹת 2 Samuel 21:20 b, literally fingers of his feet, compare ׳א "" 1 Chronicles 20:6 +?
III. צבע (perhaps √ of following; compare Arabic limp (so LagBN 20), whence hyena, Syriac id., Late Hebrew צָבוּעַ).