"Letted come" is an uncommon phrase that can be replaced with synonyms that express similar meaning. Some possible alternatives include "permitted to arrive," "allowed to approach," "granted access," "welcomed in," "invited forth," "given admission," "enabled entry," "accepted entrance," and "authorized arrival." These synonyms focus on the idea of allowing someone to come or enter into a specific place or situation. Depending on the context, other related phrases may be more appropriate, such as "welcomed to join," "encouraged to attend," "invited to participate," or "permitted to engage." Using these various synonyms can provide more diversity and clarity in language use.