The explanation may be in the pronunciation. English is a language with very lazy pronunciation. Both words would be pronounced Schulenberg in English, in the same way that burger is pronounced berger and Gettysburg is pronounced Gettysberg. German is not widely taught in Britain so most would not differentiate between burg (bourg) as in town, and berg as in mountain. Most British people do not realise that iceberg means ice mountain.
Even written English is difficult in some parts of Britain owing to local pronunciation, e.g. in my home town of Liverpool most people pronounce where and were in exactly the same way (i.e. as where), which leads to frequent written spelling mistakes. In other areas of Britain where is pronounced as wear whereas were is pronounced as whirr.