The 1880 enumerator in Floyd County, Georgia, encountered a Wilkins family headed by Anonymous. There was also a child in the household named Anonymous as well. Sometimes those names we think are incorrect are actually right. This individual appears to really have been named Anonymous based upon other records in the same location. It is possible that the name was actually Hieronymus, but that does not seem to be the case here. In the absence of other records on this individual, I would have been inclined to think that Hieronymus was the actual name and the enumerator simply made a mistake.
There is no doubt that the enumerator intended to write Anonymous as the names of these two people.
Not every entry that appears unusual is the fault of the census taker or the transcriber.