From BiblePortal Wikipedia

Hastings' Dictionary of the Bible [1]

NIGER. The second name of Symeon , one of the prophets and teachers in the Church of Antioch (  Acts 13:1 ). His name Symeon shows his Jewish origin, and Niger was probably the Gentile name which he assumed. Nothing further is known of him.

Morley Stevenson.

Fausset's Bible Dictionary [2]

Surname of Simeon, second of the five teachers and prophets of the Antioch church ( Acts 13:1). ("black".) Probably an African proselyte, because he is associated with Lucius of Cyrene in Africa. His Hebrew name, Simeon, shows his Hebrew extraction.

Morrish Bible Dictionary [3]

Designation of Simeon, one of the teachers and prophets at Antioch.  Acts 13:1 . Niger is the Latin for 'black,' and Simeon may have been so named because of his dark complexion; but this is not a necessary conclusion.

Smith's Bible Dictionary [4]

Ni'ger. (Black). Niger is the additional, or distinctive, name given to the Simeon, who was one of the teachers and prophets, in the church at Antioch.  Acts 13:1.

Hawker's Poor Man's Concordance And Dictionary [5]

We have the name of this man  Acts 13:1. He is there called a prophet, but we have no account of his ministry, or any of his writings.

Holman Bible Dictionary [6]

 Acts 13:1  Mark 15:21 Acts 13:1

Easton's Bible Dictionary [7]

 Acts 13:1

Hastings' Dictionary of the New Testament [8]

See Symeon (Simeon) called Niger.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [9]

( Νίγερ , i.e. Lat. Niger, or Black ) is the additional or distinctive name given to the Symeon ( Συμεών ) who was one of the teachers and prophets in the Church of Antioch ( Acts 13:1). He is not known except in that passage. The name was a common one among the Romans; and the conjecture that he was an African proselyte, and was called Niger on account of his complexion, is unnecessary as well as destitute otherwise of any support. His name, Symeon, shows that he was a Jew by birth; and, as in other similar cases (e.g. Saul, Paul Silas, Silvanus), he may be supposed to have taken the other name as more convenient in his intercourse with foreigners. He is mentioned second among the five who officiated at Antioch, and perhaps we may infer that he had some pre-eminence among them in point of activity and influence. It is impossible to decide (though Meyer makes the attempt) who of the number were prophets ( Προφῆται ) , and who were teachers ( Διδάσκαλοι ). (See Simeon).

The Nuttall Encyclopedia [10]

A great river of Western Africa, whose head-waters rise amid the Kong Mountains behind Sierra Leone; flowing NE. as far as Timbuctoo (2 m. from the river), it there bends gradually southward, receives from the E. its great affluent the Benuë, and about 100 m. from the coast begins to form a wide forest and jungle-covered delta (larger than that of the Nile), and finally flows into the Gulf of Guinea by 22 mouths after a course of some 2600 m. Forms, with the Benuë, an invaluable highway into the heart of the country; its upper and middle parts, under the names Joliba, &c., are within the French sphere, and the lower portion below Say is under English authority.

International Standard Bible Encyclopedia [11]

nı̄´jẽr ( Νίγερ , Nı́ger ). See Simeon , (5).

Kitto's Popular Cyclopedia of Biblial Literature [12]

Ni´ger [SIMON]