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Other variations of Kellen or Kellan include Kaelan, Kallen, Keelan, Keilan, Keillan, Kelan, Kelden, Kelle, Kellyn, and Kellin.
*Kallen Stadtfeld, character in the anime series Code Geass
Horace Mayer Kallen
Horace Kallen (1882–1974), American philosopher
Jackie Kallen (born 1946), American boxing manager
Kitty Kallen (1921–2016), American singer
Kallen Esperian (born 1961), American singer