A lot of other aspects aside, “giving him back” (which is weirdly objectifying of migrants, as if people were the property of any nation) could in many cases easily equate to issuing a death sentence. For me, that is reason enough - but I suppose your overall view on the right to live might differ.
No offense, but I’d say your claim of ‘not uncommon’ is rather inaccurate, and with an additional ‘r’ at the end, that would be even fewer people. Honestly, in all my life I’ve neither met nor heard of someone named either variant. (Though for the first one, a quick wikipedia search brings up two apparently-notable-enough people, a quick general search suggests overall it’s less than 500 out of the 84 million Germans. No result for the r-variant, and one news story about a guy struggling with his name being the German equivalent.)
I suppose “Niggemann” or similar would be more common, but also not terribly so, from my experience.