The reality star gave birth to the the little boy on 5 December (15), and on Monday (07Dec15), the couple revealed its choice of name for him in a post on Kim's website and app.

There was no mention of a middle name, despite reports that Kim would add her late father Robert to her son's moniker.

The news follows months of speculation the couple would choose another compass point for the little boy, after naming their two-year-old daughter North.

Kim, 35, previously laughed off the claims, insisting the direction theme was a ridiculous idea.

“I think it’s so stupid,” she said in an interview with NPR’s Wait Wait … Don’t Tell Me! in June. “I don’t like South West. North will always be better.”

She did admit to Ellen Degeneres she liked the name Easton, although rapper Kanye, 38, was not a fan, and last month (Nov15), she told People magazine she and her husband were putting off choosing a name until the last minute.

"It’s like the last thing that Kanye and I did when North was born," she said. "We didn’t name her for, like, seven days. I feel like it will just come to us."