köken: From Middle High German swanger, from Old High German swangar, from Proto-West Germanic *swangr (“heavy”), further origin unknown. Cognate with Old English swangor, Dutch zwanger (“pregnant”), and Yiddish שוואַנגער (shvanger, “pregnant”); compare also Lithuanian sunkùs (“heavy; difficult”).
köken: From Middle Dutch drachtich. Equivalent to dracht + -ig. Compare German trächtig, Middle Low German drachtich, from which latter Danish drægtig.
From Middle Persian [script needed] (ʾpwstn' /ābustan, ābistan/), from [script needed] (ʾpws /ābus/, “pregnant”), from Proto-Iranian *āpuθra- (“pregnant”), from *puθráh (“son”), from Proto-Indo-Iranian *putrás (“boy; son”), from Proto-Indo-European *putlós.