Abarim Publications' online Biblical Hebrew Dictionary
טלם
The root טלם (tlm) doesn't occur in the Bible apart from below names. But it appears to be cognate with verbs from several other Semitic languages (including Aramaic and Arabic), which all mean to oppress or injure.
BDB Theological Dictionary submits that the below names are all Aramaic and derive from the corresponding verb that means to oppress or injure.