Everyone here has a write-up, drawn from the same records that explain the names while you read the text.
Moses
Prophet and lawgiverRaised in Pharaoh's household, exiled for forty years as a shepherd, then sent back to demand Israel's release. He led the nation out of Egypt, received the law at Sinai, and led them forty years through the wilderness, but died on Mount Nebo within sight of the land he never entered.
Exodus 2-40NumbersDeuteronomy 34
Miriam
ProphetessMoses' sister, who watched the basket in the reeds and later led the women in song after the sea. She is called a prophetess, and she was also struck with leprosy for a week after challenging Moses' authority.
Exodus 2:4-8Exodus 15:20-21Numbers 12
Joshua
Successor to MosesMoses' assistant and one of the two spies who came back from Canaan saying it could be taken. He led the crossing of the Jordan and the conquest, and at the end of his life made the whole nation choose openly whom they would serve.
Exodus 17:8-16Exodus 33:11Numbers 13-14
Caleb
Faithful spyThe other spy who urged Israel to go up at once. Forty-five years later, at eighty-five, he asked for the hill country with the fortified cities in it, on the grounds that he was as strong as the day Moses sent him out.
Numbers 13:30Deuteronomy 1:36Joshua 14:6-14
Balak
King of MoabFrightened by the size of Israel's camp, he hired a foreign seer to curse them, and got four blessings instead. His frustration builds through the episode until he tells Balaam to stop talking altogether.
Numbers 22-24
Balaam
Seer for hireA diviner from the Euphrates hired to curse Israel, who could only say what God gave him to say, including one of the clearest messianic lines in the Torah. The Bible's later verdict on him is harsh: Numbers, Peter, Jude, and Revelation all treat him as the pattern of a religious professional who sells his gift.
Numbers 22-24Numbers 31:16Deuteronomy 23:4-5
Nadab
Aaron's eldest sonsAaron's two eldest sons, ordained as priests and among the seventy who went up the mountain and saw the God of Israel. Days after the tabernacle was consecrated they offered unauthorized fire before the LORD, and fire came out and consumed them.
Exodus 6:23Exodus 24:1-11Leviticus 10:1-7
Eleazar
Aaron's surviving sonsAaron's third and fourth sons, who inherited the priesthood after the older two, Nadab and Abihu, were killed offering unauthorized fire. Eleazar succeeded Aaron as high priest and stood with Joshua to divide the land.
Exodus 6:23-25Leviticus 10:1-7Numbers 20:25-28
Phinehas
Two priests of this nameEleazar's son, who ended a plague at Peor by driving a spear through an Israelite man and a Midianite woman, and was granted a covenant of lasting priesthood. A second Phinehas, son of Eli, was a corrupt priest who died carrying the ark into battle.
Numbers 25:6-13Joshua 22:13-34Judges 20:28
Korah
The rebellionA Levite who led two hundred and fifty leaders in challenging Moses and Aaron, arguing that the whole congregation was holy and the two of them had exalted themselves. The ground opened and swallowed the ringleaders.
Numbers 16:1-35Numbers 26:11Psalm 42 heading
Beriah
The clans of the tribesThe clan lists for the tribes other than Judah and Levi, spread across Numbers 26 and 1 Chronicles 4 to 8. Each tribe is broken into families, and the families into households, which is how land was allotted and armies were raised.
Numbers 26:1-51Numbers 27:1-111 Chronicles 4:24-43
Nahshon
The chiefs of the tribesThe twelve leaders named at the census in Numbers 1, who bring identical offerings over twelve days in Numbers 7 and are recorded in full each time, and the twelve spies of Numbers 13.
Numbers 1:5-16Numbers 7:12-83Numbers 13:4-16
Libni
The Levite clan headsThe sons and grandsons of Levi's three houses, named in the genealogies that open Exodus 6 and Numbers 3 and fill the Chronicler's registers. Libni and Shimei from Gershon; Amram, Izhar, Hebron, and Uzziel from Kohath; Mahli and Mushi from Merari.
Exodus 6:14-25Numbers 3:17-351 Chronicles 6:1-30
Kohath
The three Levite clansLevi's three sons, whose families divided the work of the sanctuary. The Kohathites carried the ark and the holiest furnishings on their shoulders, the Gershonites the curtains and coverings, the Merarites the frames, bars, and sockets.
Numbers 3:17-37Numbers 4:1-331 Chronicles 15:2-15
Nun
Fathers of Joshua and CalebJoshua son of Nun and Caleb son of Jephunneh are named with their fathers so consistently that the patronymics function almost as surnames. The two spies who brought back a minority report and the only men of their generation to enter the land.
Numbers 13:6-8Numbers 14:6-9Numbers 14:30
Sihon
Kings east of the JordanTwo Amorite kings, of Heshbon and of Bashan, who refused Israel passage and were defeated. Their names become a fixed pair in Israel's memory, recited in psalms and speeches for centuries as the standard example of what God did.
Numbers 21:21-35Deuteronomy 3:1-11Psalm 136:17-22
Machir
The clans of ManassehManasseh's son and the clan descended from him, who took Gilead east of the Jordan. In the Song of Deborah, Machir stands in for the whole tribe. A separate Machir of Lo-debar sheltered Mephibosheth and later supplied David during Absalom's revolt.
Genesis 50:23Numbers 32:39-41Deuteronomy 3:14
Aaron
First high priestMoses' older brother and spokesman, and the head of Israel's priesthood. He also made the golden calf while his brother was on the mountain, which the text reports without softening.
Exodus 4:14-16Exodus 32Leviticus 8