Kekaya's capital was known as Rājagṛha or Girivraja. Although , in the Critical addition of the Vālmīki Rāmāyaṇa , the word Girivraja is used for a city which is different from the Kekaya capital.
My doubt is that in the Mahābhāratam and post-Mahābhārata times , the Capital of the Magadha kingdom was known as Rājagṛha and Girivraja too , so is there any connection or is it just a coincidence?