df = pd.DataFrame({'Name':['Bertug Mete','a','Joe Black']})
print (df)
Name
0 Bertug Mete
1 a
2 Joe Black
df.Name = df.Name.replace(r's+', ' ', regex=True)
#similar solution
#df.Name = df.Name.str.replace(r's+', ' ')
print (df)
Name
0 Bertug Mete
1 a
2 Joe Black