I'm not in any way involved with the edits, but https://www.openstreetmap.org/way/159818656/history shows that it has been called Runcorn Wood on OSM for at least 11 years and possibly even longer -- but that's as far as the history goes. It is not a "sudden" (or at least, not a recent) change. The name also appears in a number of web pages https://www.startpage.com/do/dsearch?query=%22runcorn+wood%22+%22tottenham%22 though some of the later results are not local.