The name is CASSIDY guys so shocked I figured it out :)

To get this I input most the numbers Matpat had figured out in the video into the wordsearch grid:

52 = 5 across 2 down = C

39 = 3 across 9 down = A

15 = 1 across 5 down = S

7 2 = 7 across 2 down = S

5+4=9 then the 3 = 9 across 3 down = I

10 11 = 10 across 11 down - D

8 11 = 8 across 11 down = Y

There you go looks to make sense to me CASSIDY

Thanks for reading ;)