What is the name of the male earth pony who is Applejack's brother?

The male earth pony who is Applejack’s brother is Big McIntosh, usually called Big Mac.

Big Mac is Applejack’s older brother and Apple Bloom’s older brother, making him part of the Apple family at Sweet Apple Acres in Ponyville. He is recognized by his large red build, green yoke, and distinctive cutie mark of three green apples.

Unlike his talkative sister, Big Mac is famously quiet and often answers questions with a simple “Eeyup” or “Nope.” His dependable strength makes him an important worker on the family farm, especially during apple harvests.

A common mix-up is Braeburn, who is also an Apple family member. Braeburn is Applejack’s cousin from Appleloosa, not her brother. Big Mac later marries Sugar Belle, a baker originally from the village featured in “The Cutie Map.”