I didn't find any obituary but I did find a funeral notice for Clara E. RUNYAN and a Roy W. RUNYAN. The information on Roy listed his wife as Ethelyn, and Clara's middle initial was "E." I'm assuming that Roy W RUNYAN is the William RUNYAN you are looking for.
The Sunday Oregonian, June 20, 1948, page 2, Funeral Notices.
RUNYAN--June 18, Roy W., 3662 SE Ogden; husband of Ethelyn Runyan, father of Mrs. Fern Schauer; brother of Mrs. Viola Lincoln, Mrs. Emma English, Nate and Hugh Runyan; grandmother of Mrs. Dona Benton, great-grandmother of Diane Benton. Friends invited to services Monday, 10 a.m. at the Colonial Mortuary, Sandy blvd, at 14th. Vault interment Lincoln Memorial Park.
[Note: In the above text, the words grandmother and great-grandmother was what was actually printed in the notice. It was not grandfather or great-grandfather.]
The Oregonian, Friday, September 2, 1966, page 31, Funeral Notices.
RUNYAN--Clara E., 2365 SE 52nd ave.; mother of Mrs. Fern Schauer; grandmother of Mrs. Dona Bliss; 2 great granddaughters. Services Saturday, 10:30 am. Caldwell's Colonial Mortuary, Sandy blvd at 14th. Vault interment Lincoln Memorial Park.
William, Clara, and their daughter Fern, are all buried in Lincoln Memorial Park, Portland, Oregon. All three are listed on the Find A Grave website for that cemetery. You can either go the the Find A Grave website and enter the names and fill in the country, State, and county, or you can enter the following memorial numbers, in the box provided, and be taken to the information set up for each one. The memorial page for each of these three also has photos of their gravemarkers. All three of these memorial pages were setup by someone named Marsha. If you click on her name, at the bottom of the memorial, you will be taken to a page where you can leave her a public message or find her email address to be able to contact her directly. If she is a family member, you might want to share family information.
William Roy Runyan, memorial #97536593
Clara Ethel Oothoudt Runyan, memorial #97536655
Fern H Runyan Schauer, memorial #97536812
Clara and Fern are in the same section and lot number at the cemetery. Inspiration section, Lot 71, graves 2 and 3. William is in the Vista section, Lot 66, grave 3.