What makes a desktop look "Mac like?" Isn't it just having the panel (taskbar) on top instead of bottom, and having the "dock" at the bottom? Almost all Linux distros will do this for you (your friend). Besides "Which distro?"... you can also ask yourself, "Which Desktop Environment (DE)?"
The MATE Desktop Environment uses a panel at the top by default. You can get MATE on Ubuntu, Linux Mint, and others, but MATE is not required either. Other DE's will let you move the panel from the bottom to the top, or create a new panel at the top. Heck, you can have 4 panels: top, bottom, left, and right.
But wait, there's more!
Besides many Desktop Environments to choose from, there are also many dock apps for Linux... Cairo Dock, Docky, and Plank are just a few. Some may depend on which distro/DE that you choose.
This list is getting a little old, but it gives you more ideas about docks.
I've never used a Mac, so maybe the recommendation for Manjaro is a valid one with reasons to support it. But choices and options are what makes Linux so great, in my opinion. It just takes some time to try some out and see what is most appealing... and equally important, what works best on your (your friend's) hardware.