I don't think they have a specific name. If you search for cable management on AliExpress (or similar sites) these always came up when I tried. Found them using the same method on Amazon, though I had to scroll a bit further. https://www.amazon.com/Cable-Clips-Management-Nightstand-Accessories/dp/B00NVKHLP8/ref=zg_bs_11042051_2?_encoding=UTF8&psc=1&refRID=MGT20QBPQNS35116TYYW