What is the common name for the gibbon species Hylobates lar?

The common name for Hylobates lar is the white-handed gibbon.

It is also widely called the lar gibbon, so the stored answer is the standard common-name answer used for this species. Its name refers to the conspicuous pale hands and feet, along with the pale ring of hair around its dark face.

White-handed gibbons are apes, not monkeys. They have no functional tail and move through forest canopies by brachiation, swinging beneath branches with their long arms. Their diet is centered on fruit, supplemented by leaves, flowers, and insects.

The species occurs across parts of mainland Southeast Asia and Sumatra and is listed as Endangered. Crested gibbons belong to the genus Nomascus, agile gibbons are Hylobates agilis, and siamangs are Symphalangus syndactylus, so those options describe different gibbons or a close relative.