if and else if and and questions

Question

name = 'Shivank'
name = 'Santhosh'
name = 'Nisha'
name = 'Surya'
name = input ("What's your name?")
if name == 'Shivank':
    print("Welcome Shivank ")
if name == 'Santhosh':
    print ("Welcome Santhosh")
if name == 'Nisha':
    print("Welcome Nisha")
if name == 'Surya':
    print("Welcome Surya")
else if name != 'Shivank' or 'Santhosh' or 'Nisha' or 'Surya':
    print ("bye")

whats wrong with this code? it works till I enter in else if name !=

ps : I started like a few days ago dont be harsh :)