mercarius

mercarius [ML] 1 (as adj.) that relates to merchants or tradesmen. a1158 gildam suam ~iam (v. 2 gilda 4a). 2 merchant, trader (passing into surname). 1155 Petrus Merciarius Pipe 53; Bonda Merciarius r. c. de dimidio marce Ib. 21; 1170 Ailsi ~ius debet xx s. ‥ sed nusquam invenitur Ib. 37; c1220 Thomas de Stafford filius Marcarii et Agnetis uxoris ejus Cart. Osney II 277.