gistfile1.m

NSArray *names = @[@"Name", @"Name2", @"Name3", @"Name4"];
NSMutableArray *predicateStrings = [NSMutableArray array];
[names enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    [predicateStrings addObject:[NSString stringWithFormat:@"firstName == %@", obj]];
}];
NSString *predicateString = [predicateStrings componentsJoinedByString:@" || "];
NSPredicate *predicate = [NSPredicate predicateWithFormat:predicateString];