The Jebusite also, and the Amorite, and the Girgashite,

Wesley's Notes

1:14 The Jebusite - The names which follow until ver.17, are not the names of particular persons, but of people or nations. And all these descended from Canaan, though some of them were afterwards extinct or confounded with others of their brethren by cohabitation or mutual marriages, whereby they lost their names: which is the reason why they are no more mentioned, at least under these names.

Jamieson-Fausset-Brown Bible Commentary

14-17. the Jebusite, &c.-At 1Ch 1:14-17 the names are not those of individuals, but of people who all sprang from Canaan; and as several of them became extinct or were amalgamated with their brethren, their national appellations are given instead of the personal names of their ancestors.

Matthew Henry's Concise Commentary

1:1-27 This chapter, and many that follow, repeat the genealogies, or lists of fathers and children in the Bible history, and put them together, with many added. When compared with other places, there are some differences found; yet we must not therefore stumble at the word, but bless God that the things necessary to salvation are plain enough. The original of the Jewish nation is here traced from the first man that God created, and is thereby distinguished from the obscure, fabulous, and absurd origins assigned to other nations. But the nations now are all so mingled with one another, that no one nation, nor the greatest part of any, is descended entirely from any of one nation, nor the greatest part of any, is descended entirely from any of these fountains. Only this we are sure of, that God has created of one blood all nations of men; they are all descended from one Adam, one Noah. Have we not all one father? Has not one God created us? Mal 2:10.