• kallen,
• collen,
• callen,
• kallon,
• cullen,
• kallan,
• Collan,
• xallan,
• dallan,
• czllan,
• csllan,
• cwllan,
• cqllan,
• callzn,
• callsn,
• callwn,
• callqn,
• callab,
• callam,
• Cullan

• Callaham,
• calean,
• call in,
• call-in,
• calamia,
• calahan,
• call on,
• Callen,
• Calhoun,
• call loan,
• Callahan,
• calan,
• callihan,
• calluna,
• calumny,
• cauline,
• caelum,
• calhoon,
• calm,
• cahalan.

The plural of the "Callan" can be the "callans".

The singular of the "Callan" can be the "Callan".