From BiblePortal Wikipedia

Morrish Bible Dictionary [1]

We readthat Abraham sent the sons of Keturah and of his concubines "eastward, to the east country."  Genesis 25:6 . There were also the descendants of Ishmael and those of Esau. Many of these became 'princes,' and there can be no doubt that their descendants still hold the land. There are some who call themselves Ishmaelite Arabs, and in the south there are still Joktanite Arabs. We read of Solomon receiving gifts or tribute from the kings of Arabia.  1 Kings 10:15 . So did Jehoshaphat,  2 Chronicles 17:11; but in the days of Jehoram they attacked him, plundered his house, and carried away his wives and some of his sons,   2 Chronicles 21:17;  2 Chronicles 22:1 . They were defeated by Uzziah.  2 Chronicles 26:7 .

During the captivity some Arabians became settlers in Palestine and were enemies to Nehemiah. Cf.  Nehemiah 2:19;  Nehemiah 4:7;  Nehemiah 6:1 . Among the nations that had relations with Israel, and against whom judgement is pronounced are the Arabians.  Isaiah 21:13-17;  Jeremiah 25:24 . And doubtless they will be included in the confederacies that will be raised against God's ancient people when Israel is again restored to their land. Cf.  Psalm 83 .

In the N.T. 'Arabians' were present on the day of Pentecost, but whether they were Jews or proselytes is not stated.  Acts 2:11 .

Smith's Bible Dictionary [2]

Ara'bians. The nomadic tribes inhabiting the country to the east and south of Palestine, who in the early times of Hebrew history were known as Ishmaelites and descendants of Keturah.