King David הַמֶּלֶךְ דָּוִד was one of the most remarkable personalities in the Bible. David was a shepherd, רוֹעֶה; musician, מוּזִקַאי, poet, מְשׁוֹרֵר, army man, אִישׁ צָבָא statesman, מְדִינַאי prophet, נָבִיא, a philosopher פִילוֹסוֹפֶר, a lover מְאַהֵב, fighter לוֹחֵם and king מֶלֶךְ. He wrote about half of the Psalms תְּהִלִּים. Out of all his qualities above they chose to call him David – beloved. During his reign he united the kingdoms of Israel and Judea and thus avoided unnecessary bloodshed among brothers.I think he well deserved to be called “beloved”.
He was the father of King Solomon אָב הַמֶּלֶךְ שְׁלֹמֹה and the great grandchild of the famous Ruth the Moabite רוּת הַמוֹאָבִיָה.