Did you know you could add nicknames for your contacts which can also be utilised by Siri? This will make calling easier and apart from nicknames, you can also assign relationships such as "mom", "brother" or any other easy to recall title. You will need to tap "edit" on a particular contact card followed by "add field"; choose the "nickname" option. You can add relationships to contacts by editing your contact card; tap "edit", add the name, choose from different relationships and then hit "i" to link it with a contact.