Reference

It appears that there has been a noticeable trend in the Estonian Riigikogu where several members have changed their party affiliation, but specific individual instances are less frequently documented openly. For example, a notable recent development involved members splitting from the Estonian Conservative People's Party (EKRE), resulting in an increase in the number of non-affiliated members to 17 (source).

Moreover, the general rules around party affiliation changes and parliamentary group alignments in the Riigikogu indicate that while membership shifts do occur, documentation specific to individuals can be scattered and not always consolidated in a single source. Historical splits have also been recorded, such as those involving past members and specific factions or new political movements.

For more detailed information about specific members who have changed their party affiliation over time, you might visit the official Riigikogu site or look through more news reports around specific legislative sessions and political developments.