Please note that Mesterton-Gibbons is a single, hyphenated last name, which begins with M
and has seventeen characters including the hyphen. If you find it long
then there are two logical ways to abbreviate it. If you consider a
hyphenated name to be primarily a compound word, then the logical
abbreviation of Mesterton-Gibbons is M-G (which I prefer). If you consider a hyphenated name
to be primarily a long word, however, then the logical abbreviation of
Mesterton-Gibbons is Mesterton