Yes KIIS Los Angeles was named after their former frequency 1150 AM. It's a station where the dial is referenced in the call letters. On the TV side KXTV Sacramento the X stands for 10 and WPVI Philadelphia the VI stands for channel 6.
KIII-TV stands for Channel 3 in Texas.
WDIV stands for Channel 4 Detroit.
For Sacramento KTXL also stands for Television 40 when founding owners ran TV 40 as an independent station prior to Reinasannce, Tribune and Now Nexstar running KTXL as a Fox Affiliate in the Valley.
KRBK Sacramento under previous management originally stood for Robert Koplar it's former owner. Note KRBK also went to Springfield, Missouri for a Nexstar owned Fox affiliate.
KRBK - Wikipedia
I doubt most people except people who lived in the Sacramento area in the 1980's understand what KRBK was.
KQCA Sacramento yes "Q" under Kelly Broadcastings ownership originally included Q to mean Quality television California which itself was a reference to Kelly Broadcastings Seattle outlet KCPQ 13 now known as Fox 13 Seattle as Quality in the branding of the call letters.