Use datetime to generate a vector of datetimes and then use month property,
dt = datetime([2017*ones(12,1) (1:12).' ones(12,1)]);
month_names = month(dt,'name');
now month_names has all your month names,
12×1 cell array
'January'
'February'
'March'
'April'
'May'
'June'
'July'
'August'
'September'
'October'
'November'
'December'
Extract it just by indexing,
res = month_names([1 2 4 5 6])
res =
5×1 cell array
'January'
'February'
'April'
'May'
'June'
