Caron
Origin
Etymology Unknown; first known use is the United States Government Printing Office Style Manual of 1967, where it apparently referred to an inverted caret. Possibly derived from caret after its similar shape (^), and with -on either from macron or as an augmentative after reanalysis of -et as a diminutive.
Usage notes
Caron gained usage through the computer world, through usage at Adobe Systems and later in Unicode. As such, it is the most common name in many computer environments, whereas some form of háÄek is more common in linguistic circles.