Tonde: This name takes the first two letters of Toni and combines them with the last three letters of Dean.
Teani: This name takes the first two letters of Toni and combines them with the last three letters of Dean, but switches the order of the syllables.
Deoni: This name takes the first three letters of Dean and combines them with the last two letters of Toni.
Doti: This name takes the first two letters of Dean and combines them with the last two letters of Toni.
Tadin: This name takes the first letter of Toni and combines it with the first three letters of Dean.
Daina: This name takes the first letter of Dean and combines it with the last four letters of Toni.
These are just a few suggestions, and you can choose the combination that sounds and feels best to you.