if...elif statement in python/pandas - python-2.7

Question

I am working on a script that sorts people's names. I had this working using the csv module, but as this is going to be tied to a larger pandas project, I thought I would convert it.
I need to split a single name field into fields for first, middle and last. The original field has the first name first. ex: Richard Wayne Van Dyke.
I split the names but want "Van Dyke" to be the last name.
Here is my code for the csv module that works:
with open('inputfil.csv') as inf:
docs = csv.reader(inf)
next(ccaddocs, None)
for i in docs:
#print i
fullname = i[1]#it's the second column in the input file
namelist =fullname.split(' ')
firstname = namelist[0]
middlename = namelist[1]
if len(namelist) == 2:
lastname = namelist[1]
middlename = ''
elif len(namelist) == 3:
lastname = namelist[2]
elif len(namelist) == 4:
lastname = namelist[2] + " " + namelist[3] #gets Van Dyke in lastname
print "First: " + firstname + " middle: " + middlename + " last: " + lastname
Here is my pandas-based code that I'm struggling with:
df = pd.DataFrame({'Name':['Richard Wayne Van Dyke','Gary Del Barco','Dave Allen Smith']})
df = df.fillna('')
df =df.astype(unicode)
splits = df['Name'].str.split(' ', expand=True)
df['firstName'] = splits[0]
if splits[2].notnull and splits[3].isnull:#this works for Bret Allen Cardwell
df['lastName'] = splits[2]
df['middleName'] = splits[1]
print "Case 1: First: " + df['firstName'] + " middle: " +df['middleName'] + " last: " + df['lastName']
elif splits[2].all() == 'Del':#trying to get last name of "Del Barco"
print 'del'
df['middleName'] = ''
df['lastName'] = splits[2] + " " + splits[3]
print "Case 2: First: " + df['firstName'] + " middle: " +df['middleName'] + " last: " + df['lastName']
elif splits[3].notnull: #trying to get last name of "Van Dyke"
df['middleName'] = splits[1]
df['lastName'] = splits[2] + " " + splits[3]
print "Case 3: First: " + df['firstName'] + " middle: " +df['middleName'] + " last: " + df['lastName']
There is something basic that I'm missing.

Answer 1

if len(name) >= 3: # (assume that user only has one middle name)
firstname = splits[0]
middlename = splits[1]
lastnames = splits[2:] ( catch all last names into a list )