Corporate registry records are the useful evidence: an amendment filing, a certificate of name change, or a registry extract showing the prior and current names for the same registration. Pair that with the original signed offer and a reissued employer letter.
Keep both names in one paper trail
The goal is a set of documents a reviewer can follow without being told a story. The offer names the former entity, the registry record links the two names, and the current letter names the entity as it stands today. Retaining the superseded offer is better than replacing it quietly, since an unexplained gap between documents draws more attention than the change itself.
Assemble the set in the order a reader will need it: offer, registry extract, current letter, then anything explaining a gap between them. Where the registry is not in English, obtain a translation with the translator’s certification rather than annotating the original by hand. One record does the heavy lifting — the extract carrying both names against a single registration number — and it is worth waiting for that document rather than substituting three weaker ones.
Hypothetical example: a frame-tooling designer is offered a role by a company that later trades under a brand name; the brand appears on the letter, the registered name appears on the offer, and only the extract shows they are the same registrant. Keep the credential evaluation and any licence records in the same bundle, since the profession-specific qualification is assessed alongside the employer question, not after it.