Seems like Haran the older brother of Abraham (Abram) was a lot older than Nahor and Abraham and had daughters that Nahor could marry. Haran died in Ur of the Chaldeans and the rest of the family decided to move North West to the land of Canaan.
They went along the trade route with caravans carrying goods to trade in other cities. Along this rout there were towns/cities they could stay in and buy what they needed. It was a long journey, but they had a lot of cattle and flocks so this was their way of living moving from place to place finding food for their animals.
After a long time, probably years, they arrived in Haran and decided to stay there. My opinion is that the place they stopped and stayed in was fertile with lots of water and provision and they named the place Haran after their late brother. There Terah died at the age of 205 and Abraham and his wife were ready to continue further west to the land of Canaan.