Dante is used in a conversation between a guard and a servant - something like "Evening Dante. You look exhausted."
In TG Thieves' Guild some of the other thieves use Garrett's name as does Karras on the Victrola in his office. Karras also uses Garrett's name at the beginning of Soulforge. He also refers to Viktoria as "the woman of the woods."
The thieves in Assassin use Garrett's name at the start.
The female guard in Ambush uses Garrett's name.
Garrett uses his own name in a conversation between himself and Lotus. Garrett also uses the name Lotus and Karras in the same conversation.
Frederick Juniper Rothchild III was mentioned by himself.
In another conversation a female Noble calls her co-conversationist Christopher.
Lady Valerius was mentioned by both one of the guards and the hermit.
Lady Rumford mentions Father Karras and Jenevere at Shoalsgate.
The Hammerites discussed Cutty at Cragscleft. Garrett uses Cutty's name in the jail cell, and I believe he might have used Cutty's name in the cut scene right before Cragscleft.
Karras is mentioned by various Mechanist in and out of conversations.
Truart was mentioned in Ambush and by several guards at his Manor.
In the cutscene between Garrett and Viktoria Garrett uses her name.
Garrett mentions Captain Davidson in Shipping and Receiving.
I'm sure I could remember more but it's getting late.