From 'ashar; happiness; only in masculine plural construction as interjection, how happy! -- blessed, happy.
see HEBREW 'ashar
H835. esher
[אֶ֫שֶׁר, or אָשָׁר, compare LagBN 143]
noun [masculine] only Plural construct אַשְׁרֵי happiness, blessedness of 1 Kings 10:8 32t. and with suffix, see below; abstract intensive exclamation O happiness, blessedness of, אֵלֶּה עֲבָדֶיךָ אַשְׁרֵי אֲנָשֶׁיךָ אַשְׁרֵי happy thy men, happy these thy servants; 10:8 (= 2 Chronicles 9:7); אֱלוֺהַּ יוֺכִיחֶנּוּ אֱנוֺשׁ אַשְׁרֵי blessed the man whom Eloah correcteth Job 5:17; דֶרֶךְ תְמִימֵי אַשְׁרֵי blessed the perfect in way Psalm 119:1; אַחֲרָיו בָנָיו אַשְׁרֵי blessed his children after him Proverbs 20:7; elsewhere construct with אָדָם Psalm 32:2; 84:6; Psalm 84:13; Proverbs 3:13; 8:34; 28:14; with הַגֶּבֶר Psalm 34:9; 40:5; 94:12; 127:5; (הָ)אִישׁ 1:1; 112:1; אֱנוֺשׁ Isaiah 56:2; הַגּוֺי Psalm 33:12; הָעָם 89:16; 144:15 (twice in verse); before participle 2:12; 32:1; 41:2; 84:5; 106:3; 119:2; 128:1; Isaiah 30:18; Daniel 12:12; before verbal clauses without relative Psalm 65:5; Proverbs 8:32; with שֶֿׁ Psalm 137:8; 137:9; 146:5; with suffix אַשְׁרֶיךָ (for אֲשָׁרֶיךָ) O thy happiness ! Deuteronomy 33:29; Psalm 128:2; אַשְׁרֵיךְ Ecclesiastes 10:17; אַשְׁרֵיכֶס Isaiah 32:20; אַשְׁרָיו Proverbs 14:21; 16:20; אַשְׁרֵהוּ 29:18 (on these forms see Ges§ 93, R. 1, E).