McGregor chose to remain anonymous on the GoFundMe page itself, but the mother of the boy shared a screen shot of the email she received, which seems to out McGregor as the donor.
Grainne McCullough @GrainneMcCullou
@TheNotoriousMMA we are forever grateful I will never forget what u have done for my boy u truly are a legend
11:40 AM – Sep 27, 2018