What is the source for the custom that Yemenite Jews people count Sefira in Aramaic? and why do they do it?
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Otzar Ta'amei Haminhagim (cf.) explains that it is a remnant of a time when the spoken language was Aramaic. Since the primary purpose of s'fira is the keeping track of days it is preferable to count in a language that enables the counter to keep track - i.e. a language the counter understands.
They preserve the Babylonian custom, where the native tongue of most people was Aramaic. The earliest attestation of saying the sefira in Aramaic of which I am aware is in the siddur of R. Saadia Gaon (see here, bottom of the page).