import pandas as pd
names = {'First_name': ['Jon','Bill','Maria','Emma']}
df = pd.DataFrame(names,columns=['First_name'])
df.loc[df['First_name'] == 'Bill', 'name_match'] = 'Match'
df.loc[df['First_name'] != 'Bill', 'name_match'] = 'Mismatch'
print (df)