Ekākṣa (Ekalsha) is a follower-warrior of Skanda-Kārtikeya (Kartikeya). He helped Skanda-Kārtikeya while slaying Tārakāsura (Tarakasura).

Mahābhārata (Kinjawadekar)(9.45.58)
Mahābhārata Vols. 1-43 (Siddhāntabāgīśa)(9.42.52, see footnote, vol. 29; p. 476)