FirstNameCharTable( name )
returns the value of the identifier component of the character table
with admissible name name, if exists; otherwise false is returned.
For each admissible name, also the lowercase string is admissible.
gap> FirstNameCharTable( "m22mod3" );
"M22mod3"
gap> FirstNameCharTable( "s5" );
"A5.2"
gap> FirstNameCharTable( "J5" );
false
GAP 3.4.4