Trying to use flow to send email. How to I get the account name for the subject line

I am trying to send an email from a flow on a custom object.  I want to create the email subject line with the owners name and the account name.      I am using this as the subject line    Sales Call Report by {!$Record.ownerid}  :  {!Account.Name}    error : 

• The element has an invalid reference to "Account.Name".

  However I keep getting an error around the {!Account.Name}.        Ive tried using Account__c.Name but get  The "Account__C" resource doesn't exist in this flow.    I was originally able to get it to print this   001Pq00000oVZceIAG     I can't seem to figure out how to get this to work