Seems so, it's listed in the M-W dictionary as a variant of hijack.
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Marius HancuSeems so, it's listed in the M-W dictionary as a variant of hijack.American Heritage agrees but doesn't list one as 'variant'. or is the term they use here, with 'hijack' as the first listing. [I like AH because it doesn't list in order of 'proper'; it just lists.]