The name that is transliterated as «Thomas» in English is translated in Finnish Sign Language with the sign signifying «doubt» (referring to John 20:25). (Source: Tarja Sandholm)
«Thomas» in Finnish Sign Language (source )
In German Sign Language it is a sign that points fingers to the side of the body, referring to John 20:27.
«Thomas» in German Sign Language (source: Taub und katholisch )
For more information on translations of proper names with sign language see Sign Language Bible Translations Have Something to Say to Hearing Christians .
See also The Confession of Thomas (icon) and Thomas with the risen Christ (image).