The Kingella genus includes 3 species: Kingella kingae, Kingella denitrificans, and Kingella indologenes. IE is usually caused by K kingae.
[emedicine.com]
[…] streptococci, staphylococci, and HACEK organisms ( Haemophilus species, Aggregatibacter aphrophilus, A. actinomycetemcomitans, Cardiobacterium species, Eikenella species, and Kingella
[accessmedicine.mhmedical.com]
[…] petronella species, brucella species, Coxiella burnetii, bacteria in the HACEK group (haemophilus species, actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens and Kingella
[utmb.edu]