The comics you are reading are either written about Americans, or the names are not standardized. The common abbreviation habit of British people is to abbreviate their first and middle names, and only write their full surname. As for the family name, it doesn't have to be long. It is recommended to download a "British and American Name Dictionary", which has a detailed introduction to the origin, region, etc. of British surnames. If necessary, you can also ask me for an electronic version.