there is not even a std way of doing that
heck there is not even a std way of doing that on a computer
excel is what excel is rows and columns what data is contained is random
cvs is just rows and coloums of data where the columns are seperated by , or ;
and the rows are seperated by carriage return line feed
saved to a file called csv is a perfectly valid cvs file
When you plug your device into your computer and open iTunes it will bring it up in the initial set-up and ask you what you want to sync with in drop down menus.
If you have already done your initial setup I believe you can specify by clicking your device and in the 2nd tab it shows the email accounts, contacts, calendars, etc that are syncing and you can specify there.
Forgive me, just going off of memory, I don't have iTunes on my main work computer.
Or you may follow this guide: How to Transfer Contacts from Computer to iPhone
Is there a qucik way to import either a excel or .csv file into my iPhone 5?
In fact, iCloud is designed to backup and manage iPhone data including contacts. Thus, you can go to iCloud web page to import contacts to iPhone 5 after signing into your iCloud account. That can allow you to import a file to contacts. If you don't want to transfer contacts to iPhone with this tool, so you can use iTunes:
Connect iTunes to iPhone on PC.
Move to "Info" under the "Summary" tab.
Tick "Sync" and "Apply” to import the contacts to iPhone.