Wiktionary
idem sonans
a. (context legal of a name English) wrongly spelled, but sufficiently correct to identify someone
Wikipedia
Idem sonans
Idem sonans is a legal doctrine whereby a person's identity is presumed known despite the misspelling of his or her name. The presumption lies in the similarity between the Phonology, or sounds of the correct name and the name as written. Such similar-sounding words are called a homonym, while similar-sounding phrases or names would be a holorime.
In Latin it means "Sounding the same." Some examples are Seagrave/Segrave, Hutson/Hudson, Coonrad/Conrad, Keen/Keene, and Diadema/Deadema.