Gather
Old English gaderian, of West Germanic origin; related to Dutch gaderen, also to together.
wiktionary
From Middle English gaderen, from Old English gaderian(“to gather, assemble”), from Proto-West Germanic *gadurōn(“to bring together, unite, gather”), from Proto-Indo-European *gʰedʰ-(“to unite, assemble, keep”).
etymonline
gather (v.)
Old English gadrian, gædrian "unite, agree, assemble; gather, collect, store up" (transitive and intransitive), used of flowers, thoughts, persons; from Proto-Germanic *gaduron "come or bring together, unite" (source also of Old English gæd "fellowship, companionship," gædeling "companion;" Middle Low German gadderen; Old Frisian gaderia; Dutch gaderen "to gather," gade "spouse;" German Gatte "husband;" Gothic gadiliggs), perhaps from PIE *ghedh- "to unite, join" (see good (adj.)). Change of spelling from -d- to -th- is 1500s, reflecting earlier change in pronunciation (as in father). Related: Gathered; gathering.
gather (n.)
"plait or fold in cloth," 1660s, from gather (v.).
