KELLER BAY. Keller Bay is an inlet on the east side of Lavaca Bay 1½ miles south of the Jackson-Calhoun county line in eastern Calhoun County (at 28°36' N, 96°27' W). The bay is probably named for Francis Keller, an early Calhoun County settler. Keller Creek flows into the bay. The Olivia community overlooks the bay from its eastern shore.